Post-Head Injury Dizziness and Nausea Diagnosis and Management

Clinical Assessment and Red Flags

The American College of Emergency Physicians recommends a CT scan of the head for patients with delayed onset of dizziness and nausea following head injury, even without loss of consciousness, to rule out delayed intracranial complications 1, 2, 3
Vomiting and worsening headache are established predictors of abnormal CT findings in mild traumatic brain injury (MTBI) patients, with a particular concern for delayed onset of symptoms 1, 3
The delayed onset of symptoms, appearing days after the initial injury, is concerning as 18% of patients who deteriorate after head injury do so between days 2-7 3

A CT scan of the head without contrast is the first-line imaging study for patients with post-head injury dizziness and nausea, even without loss of consciousness 1, 2, 3
The American College of Radiology recommends considering MRI of the head if CT is negative but symptoms persist, as MRI has superior sensitivity for detecting subtle traumatic brain injuries 5

Delayed intracranial hemorrhage (subdural, epidural, or parenchymal) is a potential cause of post-head injury dizziness and nausea 1, 3
Posterior fossa injury affecting vestibular pathways is a possible cause of post-traumatic dizziness, according to the American College of Radiology 5, 6

Patients with negative CT scans should still receive close follow-up due to the risk of delayed deterioration, with clear instructions about warning signs requiring return evaluation 3, 4, 7
The American College of Emergency Physicians recommends providing written and verbal discharge instructions at approximately 6th-7th grade reading level, including instructions to return immediately for worsening headache, repeated vomiting, confusion, focal neurologic deficits, increased sleepiness, or seizures 4