Guideline Summary for Evaluation and Management of Moderate‑to‑Severe Fatigue in Adolescents

Severity Assessment

• Use a 0‑10 numeric rating scale to quantify fatigue; scores 4–10 denote moderate‑to‑severe fatigue that warrants immediate comprehensive evaluation. 1

Red‑Flag Identification

• Presence of fever, night sweats, unexplained weight loss, new or worsening pain, dyspnea, lymphadenopathy/hepatosplenomegaly, neurological symptoms, or concerning skin findings should trigger urgent work‑up for serious pathology (e.g., infection, malignancy, organ dysfunction). 1

Focused History Elements

• Obtain detailed information on fatigue onset, pattern, duration, temporal changes, aggravating/alleviating factors, impact on daily activities and school performance, and overall functional interference. 3

Assessment of Treatable Contributing Factors

Medical Comorbidities

• Anemia is a frequent cause of fatigue in adolescent females, often related to menstrual blood loss. 2
• Hypothyroidism should be considered, as thyroid dysfunction commonly produces fatigue. 3
• Sleep disturbances affect 30–75 % of patients with fatigue and should be screened for. 2
• Emotional distress is prevalent: depression occurs in roughly 25–33 % of fatigued adolescents, with anxiety also common. 2

Medication Review

• Identify medications that can cause fatigue, including β‑blockers, selective serotonin reuptake inhibitors, antihistamines, and sleep‑aid agents. 3

Nutritional and Activity Assessment

• Screen for nutritional deficiencies (vitamin B12, folate, vitamin D) that may contribute to fatigue. 2

Laboratory Workup for Moderate‑to‑Severe Fatigue (Score 4–10)

All initial tests are recommended for patients with moderate‑to‑severe fatigue. 3

Targeted Testing (based on clinical suspicion)

• Vitamin B12, folate, and vitamin D levels when nutritional deficiency is suspected. 2
• Pregnancy test in sexually active females. 4
• Monospot or EBV serology if infectious mononucleosis is a consideration. 4

Management Algorithm

Step 1 – Treat Identified Contributing Factors

• Correct anemia with iron supplementation when iron deficiency is confirmed. 2
• Initiate thyroid hormone replacement for confirmed hypothyroidism. 2
• Manage depression and anxiety using validated screening tools (PHQ‑9, GAD‑7) and consider SSRIs when appropriate. 2
• Optimize sleep through cognitive‑behavioral therapy for insomnia and treat sleep apnea if present. 2

Step 2 – Universal Interventions for All Patients

• Implement a structured, graded physical activity program (e.g., moderate walking combined with stretching). 1
• Apply sleep‑hygiene measures: consistent bedtime, limit stimulants, create a restful environment. 2
• Teach energy‑conservation strategies that balance activity, rest, and sleep. 2
• Provide patient education on the nature of fatigue, differentiating normal from pathologic fatigue, and encourage self‑monitoring. 2

Step 3 – Specialist Referral When Indicated

• Refer to specialists if fatigue persists despite correction of modifiable factors, or if organ‑specific dysfunction (cardiology, endocrinology) is identified. 3
• Refer to mental‑health professionals for persistent or severe depression/anxiety. 3
• Refer for polysomnography when a sleep‑disorder is suspected. 2

Follow‑Up Strategy

• Schedule regular follow‑up visits with repeat numeric rating‑scale assessment to monitor symptom trajectory and response to interventions. 2
• Continue periodic screening even after symptom improvement, as fatigue may recur. 5

Critical Pitfalls to Avoid

• Do not dismiss all symptoms as “normal adolescent fatigue” without a thorough evaluation for treatable conditions. 2
• Always consider medication side effects as potential contributors to fatigue. 2
• Recognize that fatigue often clusters with pain, sleep disturbance, and emotional distress; isolated fatigue is uncommon. 2
• Do not overlook menstrual‑related anemia, a highly treatable cause in adolescent females. 2
• Systematically screen for depression and anxiety, given their prevalence (≈ 25–33 % of fatigued patients). 2