What is Drowsiness?

Drowsiness refers to excessive sleepiness, reduced alertness, and difficulty staying awake. Following a head injury, drowsiness may indicate concussion, brain swelling, or intracranial bleeding.

Common Causes

• Concussion
• Brain swelling
• Intracranial hemorrhage
• Medication effects
• Sleep deprivation
• Metabolic disorders 

How is it Diagnosed?

Doctors assess:

• Level of consciousness
• Responsiveness
• Neurological status
• Glasgow Coma Scale score 

Investigations

• CT Scan Head
• MRI Brain
• Blood tests
• Neurological examination 

Treatment Options

• Observation
• Hospital admission
• Treatment of underlying cause
• Emergency neurosurgical care when required 

When Should You Consult a Doctor?

Any increasing drowsiness after head injury should be evaluated urgently.

Red Flags

• Difficulty waking the patient
• Loss of consciousness
• Vomiting
• Seizures
• Confusion
• Weakness
• Unequal pupils 

FAQs

Is it normal to feel sleepy after a concussion?

Mild sleepiness can occur, but worsening drowsiness requires immediate assessment.

Can drowsiness indicate brain bleeding?

Yes. Excessive drowsiness can be a sign of intracranial hemorrhage.

Should someone with a head injury be monitored while sleeping?

Yes. Monitoring is often recommended after significant trauma.

When to Consult:

Excessive sleepiness after a head injury should never be ignored. Early neurological assessment can help identify serious complications and improve outcomes.

What is Battle's Sign?

Battle's Sign refers to bruising over the mastoid process (the bony prominence behind the ear), typically developing 24–72 hours after a significant head injury. It results from blood tracking into the mastoid region along the posterior auricular vessels, and is a classic indicator of a middle cranial fossa basilar skull fracture.

The predictive value of Battle's Sign is clinically significant: studies demonstrate that its presence carries a greater than 75% probability of an underlying basilar skull fracture, a 66% probability of an associated brain lesion, and in some series, a near 100% correlation with skull base fracture.

PRIMARY: Simon LV, Newton EJ. Basilar Skull Fractures. StatPearls [Updated Aug 2023]. PMID: 29489178

SUPPORTING: Solai CA, et al. Clinical Signs of Basilar Skull Fracture and Their Predictive Value in Diagnosis of This Injury. J Trauma Nurs. 2018;25(5):301–306. [PMID: 30216260]

SUPPORTING: Murthy TM, et al. Battle's sign — a clinical sign of basilar skull fracture. J Clin Diagn Res. 2017;11(4):TD01–TD02. doi:10.7860/JCDR/2017/26282.9617

Common Causes

• Basilar skull fracture (middle cranial fossa)
• Severe head injury
• Road traffic accidents
• Falls from height
• Sports injuries
• Assault-related trauma

Investigations

• CT Head (preferred initial imaging)
• CT Skull Base
• MRI Brain (for soft tissue and nerve assessment)
• Neurological examination
• Hearing assessment (audiometry)

What is Migraine?

Migraine is a primary neurological disorder characterized by recurrent episodes of moderate to severe unilateral (or occasionally bilateral) headache, typically pulsating in quality, lasting 4–72 hours, and associated with nausea, vomiting, photophobia, and phonophobia. It is the second most common cause of disability worldwide.

Approximately 25–30% of migraine patients experience aura — transient, fully reversible neurological symptoms (typically visual, sensory, or speech-related) that precede or accompany the headache phase. In "migraine aura without headache," neurological symptoms occur without the headache phase.

Headache Classification Committee of the International Headache Society. ICHD-3. Cephalalgia. 2018;38(1):1–211. doi:10.1177/0333102417738202 — Authoritative classification and diagnostic criteria for migraine.

Diagnosis

ICHD-3 criteria for migraine without aura require: ≥5 attacks lasting 4–72 hours with at least 2 of the following headache features (unilateral, pulsating, moderate/severe, worsened by activity) AND at least 1 of: nausea/vomiting, or photophobia and phonophobia.

Treatment

• Acute: triptans (first-line), NSAIDs, antiemetics, CGRP antagonists (gepants)
• Preventive: beta-blockers (propranolol), topiramate, amitriptyline, anti-CGRP monoclonal antibodies (erenumab, fremanezumab)
• Lifestyle: sleep hygiene, hydration, stress management, trigger avoidance

Clinical Overview

Headache is one of the most prevalent neurological symptoms and can arise from a wide spectrum of causes ranging from benign tension-type headache to life-threatening intracranial pathology. Following head trauma, post-traumatic headache is defined as a headache developing within 7 days of injury and is a recognized diagnostic entity in the International Classification of Headache Disorders, 3rd edition (ICHD-3).

Headache Classification Committee of the International Headache Society (IHS). ICHD-3. Cephalalgia. 2018;38(1):1–211. doi:10.1177/0333102417738202

McCrory P, et al. Consensus statement on concussion in sport — 5th Berlin conference 2016. Br J Sports Med. 2017;51(11):838–847. doi:10.1136/bjsports-2017-097699 — Headache is the most commonly reported post-concussion symptom.

Common Causes

• Post-traumatic headache (concussion)
• Intracranial hemorrhage
• Skull fracture
• Migraine
• Tension-type headache
• Cervicogenic headache (neck-related)
• Medication overuse headache

The Thunderclap Headache

A sudden-onset, severe headache reaching maximal intensity within seconds to minutes ("worst headache of life") is a neurological emergency until proven otherwise. This pattern raises immediate suspicion of subarachnoid hemorrhage (SAH) and requires urgent CT Head followed by lumbar puncture if CT is negative.

Investigations

• CT Head (first-line in acute severe headache)
• MRI Brain (for subacute and chronic presentations)
• Lumbar puncture (when SAH suspected and CT is normal)
• Neurological examination
• Blood tests