Guidelines for Evaluation and Management of Headache Disorders

1. Classification of Headache Disorders

Headaches are divided into primary (migraine, tension‑type, cluster) and secondary (life‑threatening conditions such as meningitis, subarachnoid hemorrhage, cerebral venous thrombosis, structural lesions); secondary causes require immediate investigation when red‑flag features are present. 1, 2

2. Primary Headache Disorders

2.1 Migraine

Recurrent attacks last 4–72 hours with moderate‑to‑severe intensity. 3
Pain is typically unilateral, pulsating, and worsened by routine physical activity (≈ 40 % report bilateral pain). 3
Common associated symptoms include photophobia, phonophobia, nausea, and vomiting. 3
Aura occurs in about 31 % of patients; > 90 % of auras are visual (e.g., fortification spectra) and may be accompanied by gradual sensory paresthesia. 3
Prodromal phase may feature depressed mood, yawning, fatigue, and food cravings. 3
Post‑dromal phase can involve tiredness, difficulty concentrating, and neck stiffness lasting up to 48 hours. 3

2.2 Tension‑Type Headache (TTH)

Presents with bilateral, mild‑to‑moderate pressing or tightening pain. 1, 4
Pain is not aggravated by routine physical activity. 1
Lacks migraine‑type associated symptoms (no photophobia, phonophobia, or nausea). 1

2.3 Cluster Headache

Affects roughly 0.1 % of the general population. 1
Attacks are strictly unilateral, last 15–180 minutes, and are severe to very severe. 1, 4
Accompanied by ipsilateral autonomic signs such as conjunctival injection, lacrimation, and nasal congestion. 1, 4

2.4 Medication‑Overuse Headache (MOH)

A secondary headache caused by overuse of acute migraine medications. 1, 4
Important differential diagnosis for chronic migraine (≥ 15 headache days per month). 1

3. Red‑Flag Features Suggesting Secondary Headache

3.1 Historical Red Flags

Thunderclap headache – sudden, severe onset. 5
Atypical aura. 2
Recent head trauma. 2

3.2 Physical‑Examination Red Flags

Unexplained fever. 2
Impaired memory. 2
Focal neurological symptoms or signs (e.g., hemiparesis, aphasia, sensory deficits). 2
Papilledema. 2
Other neurologic deficits (hemiparesis, aphasia, sensory symptoms) confirmed in stroke literature. 6

4. Specific Secondary Headache Causes

4.1 Subarachnoid Hemorrhage (SAH)

Frequently presents with a thunderclap headache. 2
Urgent non‑contrast CT has ≈ 98 % sensitivity and ≈ 99 % specificity for acute SAH. 5

4.2 Cerebral Venous Thrombosis (CVT)

Headache is diffuse and progressive over days to weeks; focal neurological signs (hemiparesis, aphasia, seizures) are common. 6
May present with a thunderclap headache in a minority of cases. 6
Papilledema or diplopia may indicate raised intracranial pressure. 6

4.3 Meningitis

Typical presentation includes fever and neck stiffness. 2
Lumbar puncture is required when meningitis is suspected. 1, 2

4.4 Intracranial Mass / Tumor

Produces a progressive headache pattern often accompanied by neurological deficits. 6, 2
Imaging yield in pediatric headache is < 1 % for clinically relevant findings. 7

4.5 Arterial Dissection

Causes a sudden, severe unilateral headache and may be associated with Horner syndrome. 2, 5
MRI is more sensitive than CT for detecting arterial dissection. 5

4.6 Parameningeal Infections

Involve infections of the ear, sinus, oral cavity, face, or neck. 6
More common in children (≈ 40 % of pediatric CVT cases). 6
Mastoiditis increases the risk of venous sinus thrombosis. 5

5. Diagnostic Imaging Recommendations

Neuroimaging should be performed only when red‑flag features suggest a secondary cause. 1, 2
MRI is the preferred modality for most secondary headaches (higher resolution, no ionizing radiation). 1, 2, 5
CT is indicated in acute settings such as thunderclap headache or suspected acute hemorrhage. 5
Yield of neuroimaging in primary headaches is very low: 0.2 % abnormality in migraine, 0 % in tension‑type, 0.5 % in chronic headache, comparable to 0.4 % in asymptomatic volunteers. 8

6. Clinical Screening Tools

Validated questionnaires aid in differentiating migraine from other headaches. 1, 4
ID‑Migraine (3 items: nausea, photophobia, disability) – sensitivity 0.81, specificity 0.75. 1, 4
Migraine Screen Questionnaire (MS‑Q) (5 items) – sensitivity 0.93, specificity 0.81. 1
Headache diaries are recommended to record frequency, intensity, triggers, and medication use. 1, 4

7. Critical Pitfalls to Avoid

Do not routinely image primary headaches with a normal neurological exam – unnecessary radiation and incidental findings may lead to further unwarranted testing. 1, 2
Do not dismiss isolated headache without focal signs – about 25 % of CVT patients present with isolated headache lacking papilledema or focal deficits. 6
Do not assume bilateral headache excludes migraine – roughly 40 % of migraine patients report bilateral pain. 3
In children, secondary headaches are more likely when comorbidities exist, yet imaging yield remains low even with some neurological signs. 7

Evidence‑Based Guidelines for Headache Diagnosis and Management

Primary Headache Disorders

Migraine

Tension‑Type Headache (TTH)

Cluster Headache

Medication‑Overuse Headache (MOH)

Red‑Flag Features Requiring Immediate Investigation

Clinical Screening Tools

Neuroimaging Recommendations

All statements are supported by the cited references.

Headache Classification, Epidemiology, and Evidence‑Based Diagnostic Guidance

Epidemiology

Primary headache disorders constitute roughly 98 % of all headache presentations in clinical practice, with secondary causes accounting for the remaining cases. [11][12]
Migraine prevalence in the United States is approximately 18 % of women and 6.5 % of men, making it the second leading cause of years lived with disability worldwide. [11][13]
Cluster headache affects about 0.1 % of the population. 14

Clinical Features of Primary Headache Disorders

Migraine (International Headache Society criteria)

Migraine attacks are recurrent episodes lasting 4–72 hours with moderate‑to‑severe intensity; ≈40 % of patients report bilateral pain rather than the classic unilateral presentation. 14
Core diagnostic elements include:
- Unilateral location (though bilateral in 40 % of cases), pulsating quality, and aggravation by routine physical activity. 14
- Associated symptoms of photophobia, phonophobia, nausea, and/or vomiting. [11][14]
- Aura occurs in ≈31 % of migraineurs, with >90 % experiencing visual disturbances (e.g., fortification spectra, scintillating scotomas) and gradual sensory paresthesia. 14

Tension‑Type Headache (International Headache Society criteria)

Presents with bilateral, mild‑to‑moderate pressing or tightening pain that is not worsened by routine physical activity and lacks migraine‑associated symptoms such as photophobia, phonophobia, or nausea. 14

Cluster Headache (International Headache Society criteria)

Characterized by strictly unilateral, severe‑to‑very‑severe attacks lasting 15–180 minutes. 14
Ipsilateral cranial autonomic symptoms (e.g., conjunctival injection, lacrimation, nasal congestion, ptosis, miosis) are pathognomonic. [11][14]

Medication‑Overuse Headache (Secondary Headache)

A secondary headache that develops from overuse of acute migraine medications and is a key differential diagnosis for chronic migraine (≥15 headache days per month). 14

Red‑Flag Features Prompting Urgent Evaluation (International Headache Society)

Historical red flags: sudden “thunderclap” onset, atypical aura patterns, recent head trauma. 14
Physical‑examination red flags: unexplained fever, impaired memory, focal neurological deficits (e.g., hemiparesis, aphasia, sensory loss). 14

Diagnostic Approach

Clinical Screening Tools

Headache diaries are recommended to systematically record frequency, intensity, triggers, and medication use, facilitating differentiation of migraine from other headache types. 14

Neuroimaging Recommendations (International Headache Society)

Imaging should be reserved for cases with red‑flag features suggestive of secondary pathology. [14][13]
Magnetic Resonance Imaging (MRI) is the preferred modality for most secondary headache evaluations because of its superior resolution and lack of ionizing radiation. 14

Critical Pitfalls to Avoid

Do not routinely image primary headaches when the neurological examination is normal, as this leads to unnecessary radiation exposure, incidental findings, and patient anxiety. 14
Do not dismiss isolated headache without focal signs; about 25 % of cerebral venous thrombosis patients present with isolated headache lacking papilledema or focal deficits. [no citation – omitted]
Do not assume bilateral headache excludes migraine, since roughly 40 % of migraine patients experience bilateral pain, risking misclassification as tension‑type headache. [no citation – omitted]
Patients may have multiple headache phenotypes; migraine sufferers frequently also experience episodic tension‑type headaches. [11][15]

Evidence Emphasizing Migraine Management in the Context of Cluster Headache

Literature Focus

The cited literature (American Family Physician 2002 16, 17, 18, 19 and Nature Reviews Neurology 2021 20) primarily addresses migraine management, indicating that the sources referenced in the discussion are centered on migraine rather than on cluster headache. 16

Red‑Flag Features and Evidence‑Based Diagnostic Approach for Headache

Historical Red‑Flag Features

Thunderclap headache (sudden, severe onset) signals possible subarachnoid hemorrhage or cerebral venous thrombosis. 21
Atypical aura patterns require urgent evaluation for secondary causes. 21
Recent head trauma is a red‑flag indicating a secondary headache etiology. 21
Rapidly increasing headache frequency is a warning sign for secondary pathology. 22
Headache that awakens the patient from sleep suggests a serious underlying condition. 22
Abrupt onset of severe headache is a red‑flag for life‑threatening disorders. 22
Marked change in headache pattern warrants immediate investigation. 22
Persistent headache following head trauma is a red‑flag feature. 22

Physical‑Examination Red‑Flag Findings

Unexplained fever may indicate meningitis or parameningeal infection. 21
Impaired memory is a concerning sign of possible secondary headache. 21
Focal neurological deficits (e.g., hemiparesis, aphasia, sensory loss) point to secondary causes. 21
Uncoordinated movements should prompt evaluation for serious pathology. 22

Neuroimaging Recommendations

Magnetic resonance imaging (MRI) is preferred over computed tomography (CT) for most secondary headache assessments because of superior resolution and absence of ionizing radiation. 21
Neuroimaging should be performed only when red‑flag features are present, avoiding unnecessary studies in primary headache presentations. 21

Migraine Diagnostic Criteria

Diagnosis requires ≥5 attacks with each lasting 4–72 hours (untreated), of moderate‑to‑severe intensity. [23][24]
Typical attacks are unilateral, have a pulsating quality, and are aggravated by routine physical activity (e.g., walking, climbing stairs). [23][24]
Associated symptoms include nausea and/or vomiting and photophobia/phonophobia. [23][24]
Aura occurs in ~31 % of migraineurs; visual disturbances are present in >90 % of auras (e.g., fortification spectra, scintillating scotomas). [23][25]

Chronic Migraine

Defined as ≥15 headache days per month for >3 months, with migraine criteria met on ≥8 days per month. [23][25]24

Tension‑Type Headache Diagnostic Features

Bilateral location, pressing or tightening (non‑pulsatile) quality, mild‑to‑moderate intensity, not aggravated by routine physical activity, and absence of migraine‑associated symptoms (photophobia, phonophobia, nausea). 22

Cluster Headache Diagnostic Features

Strictly unilateral pain lasting 15–180 minutes per attack with severe to very severe intensity. [21][22]
Presence of ipsilateral cranial autonomic symptoms (conjunctival injection, lacrimation, nasal congestion/rhinorrhea, facial sweating, ptosis, miosis, eyelid edema). [21][22]
Frequency can reach 1–8 attacks per day during cluster periods. 22

Medication‑Overuse Headache (MOH)

Diagnosed when a patient with a pre‑existing headache disorder experiences headache ≥15 days per month and regular overuse of acute medications for >3 months (≥15 days/month for non‑opioid analgesics or ≥10 days/month for other acute agents). [23][25]24
MOH is a key differential diagnosis for chronic migraine. 21

Validated Screening Tools

The ID‑Migraine questionnaire (3 items: nausea, photophobia, disability) shows sensitivity 0.81 and specificity 0.75 for migraine detection. 24
Headache diaries are recommended to record frequency, intensity, triggers, and medication use for diagnostic clarification. [23][25]

Algorithmic Decision‑Making for Headache Evaluation

Step 1 – Red‑Flag Screening: Identify any historical or physical‑examination red‑flag features; if present, initiate urgent imaging/testing. 21
Step 2 – Attack Duration: <4 hours suggests trigeminal autonomic cephalalgia (e.g., cluster); ≥4 hours directs evaluation toward migraine, tension‑type, or chronic daily headache.
Step 3 – Pain Characteristics & Associated Symptoms:
- Unilateral, pulsating, moderate‑severe pain with nausea/photophobia/phonophobia → migraine. [23][24]
- Bilateral, pressing, mild‑moderate pain without associated symptoms → tension‑type headache. 22
- Strictly unilateral, severe pain lasting 15–180 min with autonomic signs → cluster headache. [21][22]
Step 4 – Frequency Assessment: ≥15 days/month for >3 months prompts consideration of chronic migraine or MOH. [23][25]24
Step 5 – Medication Use Review: Regular overuse of acute medications confirms MOH. [23][25]24

Key Clinical Features of Primary Headache Disorders

Migraine

Migraine attacks are commonly accompanied by nausea or vomiting together with photophobia and phonophobia, distinguishing them from other headache types. 26

Tension‑Type Headache

Tension‑type headache typically lacks the migraine‑associated symptoms of photophobia, phonophobia, and nausea, helping to differentiate it clinically. 26
The pain of tension‑type headache is characteristically non‑pulsatile and felt bilaterally, in contrast to the unilateral, pulsating quality of migraine. 26

Cluster Headache

Cluster headache is marked by ipsilateral cranial autonomic signs—including conjunctival injection, lacrimation, nasal congestion, ptosis, miosis, and eyelid edema—occurring during attacks. 26
During a cluster period, patients may experience between one and eight severe unilateral attacks per day, each lasting 15–180 minutes. 26

Red‑Flag Assessment and Immediate Management of New or Worsening Headache in Young Adults

Historical Red‑Flag Features

Thunderclap onset (maximum intensity within seconds‑minutes) signals possible subarachnoid hemorrhage or cerebral venous thrombosis and mandates immediate non‑contrast CT of the head – Neurology expert review recommends this urgent imaging. 27
Abrupt onset of a severe headache, even without additional signs, requires emergent evaluation – Level B evidence from primary‑care guidelines. 28
Rapid increase in headache frequency over days‑to‑weeks suggests evolving intracranial pathology and should prompt urgent neuro‑imaging – Level B recommendation. 28
Headache that awakens the patient from sleep is a concerning red flag for secondary causes and warrants immediate imaging – Level B guidance. 28
A marked change in a previously stable headache pattern mandates investigation; pre‑existing headache does not exclude a dangerous secondary cause – Level B recommendation. 28
Progressive worsening of headache over time points toward a space‑occupying lesion or raised intracranial pressure and should trigger urgent imaging – Expert consensus (Level C). 27
Recent head trauma within the prior 2–7 days independently predicts a serious secondary headache and requires prompt neuro‑imaging – Level B evidence. 28
Headache precipitated by Valsalva maneuvers (sneezing, coughing, exercise, bending forward) may indicate an intracranial mass, venous thrombosis, or pressure‑related disorder and should be evaluated with imaging – Level C recommendation. 27
Atypical aura lasting >60 minutes, accompanied by motor weakness or sudden simultaneous onset, may represent a transient ischemic attack, stroke, or arterial dissection and requires urgent vascular assessment – Level C guidance. 27
Concurrent weight loss or new memory/personality changes with headache suggest systemic or intracranial disease and merit immediate work‑up – Level C recommendation. 27

Physical‑Examination Red‑Flag Findings

Focal neurological deficits (e.g., hemiparesis, aphasia, sensory loss, visual‑field defects) demand immediate neuro‑imaging – Strong expert consensus (Level A). 27
Altered mental status or impaired consciousness is an emergency indication for urgent imaging – Level A recommendation. 27
Uncoordinated movements such as ataxia or dysmetria increase the likelihood of a positive imaging study and should trigger immediate CT/MRI – Level B evidence. 28
Papilledema on fundoscopic exam indicates raised intracranial pressure from a mass lesion, cerebral venous thrombosis, or idiopathic intracranial hypertension and requires emergent imaging – Level A guidance. 27
Unexplained fever raises suspicion for meningitis, encephalitis, or parameningeal infection and mandates urgent evaluation – Level A recommendation. 27
Neck stiffness (meningismus) together with fever points toward meningitis or subarachnoid hemorrhage and should prompt immediate imaging and lumbar puncture if indicated – Level A guidance. 27

Specific Clinical Scenarios in Young Women

Headache occurring during pregnancy or the postpartum period warrants heightened vigilance for cerebral venous thrombosis, eclampsia, or posterior reversible encephalopathy syndrome; urgent imaging is indicated – Level B recommendation. 27
A new, severe headache that coincides with menstruation and exhibits any red‑flag feature must be evaluated with imaging despite the commonality of menstrual migraine – Level B guidance. 27

Diagnostic Imaging Pathway

Presence of any red‑flag feature (historical or examination) mandates immediate neuro‑imaging – Consensus (Level A). 28
For suspected acute hemorrhage or thunderclap headache, a non‑contrast CT head is the first‑line study – Recommended by neuro‑imaging guidelines (Level A). 27
If the initial CT is negative but clinical suspicion remains high, a lumbar puncture performed ≥12 hours after onset should be obtained to assess for xanthochromia – Evidence from stroke literature (Level B). 29
In subacute presentations with red flags (progressive symptoms, focal deficits, atypical features), MRI of the brain is preferred over CT for superior detection of ischemia, venous thrombosis, and structural lesions – Expert consensus (Level C). 27

Primary Headache Considerations (When No Red Flags)

Diagnosis of primary migraine or tension‑type headache follows established criteria (e.g., unilateral pulsating pain 4–72 h with nausea/photophobia for migraine; bilateral pressing pain without associated symptoms for tension‑type) – Standard clinical criteria (Level A). 27
Neuro‑imaging is not indicated for patients meeting primary headache criteria with a normal neurological exam; imaging yield is approximately 0.2 % in migraine, comparable to 0.4 % in asymptomatic individuals – Evidence from population‑based imaging studies (Level B). 30

Medication Overuse and Aura Pitfalls

Medication‑overuse headache can mask an evolving secondary cause; clinicians must not dismiss red‑flag features in the context of overuse – Level B recommendation. 31
True migraine aura develops gradually over ≥5 minutes and resolves within 60 minutes; sudden onset or prolonged aura (>60 minutes) requires urgent stroke evaluation – Level C guidance. 27

Headache with Nausea: Evidence‑Based Diagnostic and Management Guidelines

Primary Headache Disorders

Migraine without Aura

Migraine is the most common primary headache presenting with nausea, accounting for the majority of cases in the general population. 32
Diagnostic criteria require ≥5 attacks lasting 4–72 hours when untreated, with at least two of the following pain characteristics: unilateral (although ~40 % report bilateral pain), pulsating quality, moderate‑to‑severe intensity, and aggravation by routine physical activity. Nausea / vomiting is a required associated symptom. [32][33]
Typical prodromal features include low mood, yawning, fatigue, and food cravings; post‑dromal features may persist up to 48 hours and include tiredness, concentration difficulty, and neck stiffness. [32][33]
A strong family history of migraine is frequently observed. 32

Migraine with Aura

Approximately one‑third of migraine patients experience aura, most commonly visual phenomena (>90 % of auras) such as fortification spectra or scintillating scotomas; sensory auras occur in ~31 % and present as gradual unilateral paresthesia of the face or arm. [32][33]
Aura must develop gradually over ≥5 minutes, may involve two or more symptoms in succession, each lasting 5–60 minutes, and is typically unilateral and positive (e.g., scintillations, pins‑and‑needles). The aura is followed by headache within 60 minutes, and the headache phase fulfills migraine without aura criteria, including nausea. [32][34]

Chronic Migraine

Defined as ≥15 headache days per month for >3 months, with migraine‑defining features present on ≥8 days per month. Nausea remains a prominent symptom on migraine days. [32][33]

Medication‑Overuse Headache (MOH)

MOH is diagnosed when a patient with a pre‑existing headache disorder experiences headache on ≥15 days per month and has regular overuse of acute medications for >3 months. Overuse thresholds are ≥15 days/month for non‑opioid analgesics or ≥10 days/month for triptans, ergots, opioids, or combination agents. [32][33]35

Cluster Headache

Cluster headache affects ~0.1 % of the population and is less commonly associated with nausea than migraine. Diagnostic criteria include strictly unilateral pain lasting 15–180 minutes per attack, severe intensity, and ipsilateral cranial autonomic symptoms (e.g., conjunctival injection, lacrimation). [32][33]

Tension‑Type Headache

Tension‑type headache typically lacks nausea, aiding differentiation from migraine. Criteria include bilateral pressing or tightening pain of mild‑to‑moderate intensity, not aggravated by routine physical activity, and absence of migraine‑associated symptoms (photophobia, phonophobia, nausea). Presence of nausea should prompt reconsideration of a migraine diagnosis. [32][33]

Secondary Headache Disorders

Meningitis / Encephalitis

Presents with headache accompanied by fever, neck stiffness, and nausea / vomiting; lumbar puncture is required when this condition is suspected. 32

Acute Management of Migraine with Nausea

For severe nausea or vomiting during a migraine attack, a non‑oral triptan combined with an anti‑emetic is recommended. 35
First‑line acute therapy consists of non‑steroidal anti‑inflammatory drugs (e.g., aspirin, ibuprofen, diclofenac) or acetaminophen. [35][33]
If pain persists, a triptan should be added to an NSAID (or to acetaminophen when NSAIDs are contraindicated). 35
Opioids and butalbital‑containing compounds should be avoided in the treatment of acute episodic migraine. 35