The Short Answer Educational content only. Any suspected concussion warrants medical evaluation. New, severe, or changing headache after head injury warrants prompt assessment by a physician, neurologist, or headache specialist to confirm the diagnosis and exclude dangerous causes. Consult a concussion-experienced clinician for individualized care. Strictly one-sided head pain differs from typical post-concussion headache because pain that always stays on the same side points toward migraine, a trigeminal autonomic cephalalgia, or a temporal or cervical source rather than the usual bilateral tension-type pattern (Ashina et al., 2019). Typical post-concussion headache is often a bilateral pressing ache. Pain that is consistently on one side, and especially pain that never switches sides, is a diagnostic clue that narrows the possibilities toward specific disorders with specific treatments. In older adults, a new one-sided temporal headache also prompts consideration of temporal arteritis, a treatable condition that needs urgent recognition. Recognizing strict laterality changes the evaluation and treatment. Typical post-concussion headache is often bilateral and pressing. Consistent one-sidedness points toward migraine, a trigeminal autonomic cephalalgia, or a cervical source. New one-sided temporal pain in older adults prompts consideration of temporal arteritis. What Typical Post-Concussion Headache Looks Like The most common post-concussion headache is tension-type, a bilateral, pressing, band-like ache felt on both sides of the head. Migraine, the other common phenotype, is frequently one-sided but tends to shift sides between attacks or spread. Against this background, pain that stays strictly on one side, especially pain that never moves to the other side across many episodes, stands out and directs attention to a narrower set of diagnoses. Why Strict One-Sidedness Is a Clue Consistent laterality is diagnostically useful because several specific headache disorders are defined partly by staying on one side. Migraine is often unilateral within an attack, though it commonly varies which side it affects over time. The trigeminal autonomic cephalalgias, cluster headache, paroxysmal hemicrania, hemicrania continua, and SUNCT, are strictly one-sided and add same-side autonomic features such as tearing and nasal congestion. A cervical or occipital source can produce consistently one-sided pain when a particular joint or nerve on that side is involved. Temporal pain concentrated over one temple has its own considerations. The practical value is that strict, unchanging one-sidedness raises the priority of these specific diagnoses over the default tension-type pattern, and it prompts the clinician to look for the accompanying features, autonomic signs, attack timing, cervical reproduction, that pin down which one. The Temporal Arteritis Consideration In adults over about 50, a new one-sided headache over the temple carries a specific concern: giant cell arteritis, also called temporal arteritis, an inflammation of the temporal and other arteries. It can cause tenderness over the temporal artery, jaw pain with chewing, scalp tenderness, and, critically, sudden vision loss if untreated. It is a medical urgency because prompt treatment prevents blindness. While it is unrelated to the concussion itself, a new one-sided temporal headache in an older adult must not be assumed to be post-traumatic without considering this diagnosis, which is confirmed with blood tests and sometimes a biopsy and treated urgently. Symptom Presentation Pain consistently on one side, sometimes never switching sides Same-side autonomic features suggesting a trigeminal autonomic cephalalgia Throbbing with nausea and light sensitivity suggesting migraine Reproduction with neck movement or pressure suggesting a cervical source Temporal tenderness, jaw claudication, or scalp tenderness in older adults suggesting arteritis A pattern that does not fit the usual bilateral tension-type ache Assessment A clinician characterizes the one-sided pain by its associated features: autonomic signs point toward a trigeminal autonomic cephalalgia, throbbing with nausea and light sensitivity toward migraine, and reproduction with cervical examination toward a neck source. Attack duration and frequency further separate the trigeminal autonomic cephalalgias from each other. In an older adult with new temporal pain, the clinician screens for giant cell arteritis with examination and blood tests and treats urgently if suspected. Imaging is obtained when a structural cause or a trigeminal autonomic cephalalgia is suspected. Treatment Approach Treatment follows the specific diagnosis that the laterality helped identify. Migraine is treated with acute and preventive migraine strategies. A trigeminal autonomic cephalalgia is treated with its specific therapies under specialist guidance. A cervical or occipital source is treated with physical therapy, manual therapy, and, for occipital neuralgia, nerve blocks. Giant cell arteritis is a medical urgency treated promptly to prevent vision loss, separate from any headache management. Across the specific treatments, the general supports apply. Addressing the cervical contribution helps many one-sided headaches, since the neck commonly refers pain to one side of the head. Protecting sleep, regulating the autonomic nervous system, keeping hydration and meals steady, and avoiding medication overuse all reduce the overall headache burden. The essential step, though, is using the strict one-sidedness and its accompanying features to reach the specific diagnosis that directs treatment. Post-traumatic headache often has a cervical and autonomic component that responds to daily mobility and nervous system regulation alongside medical care. Start your 3-day free trial to build a supportive routine. Supporting Mobility Routine JME 155 Diaphragmatic breathing lowers the sympathetic drive that fuels headache and supports steady cerebral blood flow. Ten slow breaths, several times daily. JME 14 Chin tucks activate deep cervical flexors and reduce the upper cervical tension that refers pain to the head. Ten repetitions with 5-second holds. JME 1 Cervical rotation restores segmental mobility at the joints that refer pain into headache through the trigeminocervical nucleus. Ten repetitions per direction. JME 15 Cervical lateral flexion addresses side-bending restriction that sustains neck-driven headache. Ten repetitions per side. JME 16 Cervical flexion and extension restore sagittal mobility restricted by suboccipital guarding. Eight slow repetitions. JME 2 Cervical retraction reinforces a neutral head position that reduces the postural strain feeding headache. Ten repetitions per set. JME 150 Thoracic rotation restores mid-back motion needed for full cervical range and relaxed upright posture. Eight repetitions per direction. JME 227 Overhead reach opens the thoracic spine and reduces the compensatory upper cervical extension that drives headache. Ten repetitions with controlled tempo. Start your 3-day free trial for joint-specific mobility programming that addresses the cervical and autonomic contributors to post-traumatic headache. Common Mistakes Assuming one-sided pain is ordinary migraine without checking for autonomic or cervical features Missing giant cell arteritis in an older adult with new temporal pain Overlooking a treatable cervical or occipital source of consistent one-sided pain Not distinguishing among the trigeminal autonomic cephalalgias, which have different treatments Applying the default tension-type approach to a strictly one-sided headache Progression Assessment uses the strict one-sidedness and its accompanying features, autonomic signs, migraine features, cervical reproduction, to reach a specific diagnosis, with urgent screening for giant cell arteritis in older adults with new temporal pain. Treatment follows the identified disorder, migraine, a trigeminal autonomic cephalalgia, or a cervical source, with general supports across all. Correct identification of the pattern directs the effective treatment. What does it mean if my headache is always on the same side after a concussion? Consistent one-sidedness points away from the usual bilateral tension-type pattern toward migraine, a trigeminal autonomic cephalalgia, or a temporal or cervical source. Pain that never switches sides is a diagnostic clue that narrows the possibilities and prompts the clinician to look for accompanying features that identify the specific disorder. How is strictly one-sided pain different from typical post-concussion headache? Typical post-concussion headache is often a bilateral pressing tension-type ache. Pain that stays strictly on one side, especially with same-side autonomic features or a distinct attack pattern, indicates a specific disorder with specific treatment rather than the default pattern. The consistent laterality changes the evaluation. When is a one-sided headache an emergency? A new one-sided temporal headache in an adult over about 50 prompts consideration of giant cell arteritis, which can cause vision loss and needs urgent treatment. Any headache with red flags, sudden severe onset, neurological changes, fever, or vision loss, warrants emergency evaluation regardless of side. Can my neck cause a one-sided headache after a concussion? Yes. A cervical or occipital source on one side commonly refers pain to that side of the head, producing a consistently one-sided headache reproduced by neck movement or pressure. This is treatable with physical therapy, manual therapy, and, for occipital neuralgia, nerve blocks, so identifying a cervical source matters. Why does one-sided pain need a specific diagnosis? Because the disorders it points to, migraine, the various trigeminal autonomic cephalalgias, a cervical source, or giant cell arteritis, have distinct treatments. Using the laterality and its accompanying features to reach the specific diagnosis directs effective treatment and, in the case of arteritis, prevents serious complications. Red Flags Requiring Urgent Evaluation The following warrant same-day emergency evaluation rather than routine care. Sudden severe headache that peaks within seconds to minutes Headache with fever, neck stiffness, or rash New weakness, numbness, slurred speech, or facial droop New vision loss, double vision, or a persistent visual change Progressive worsening headache over days to weeks Headache with confusion, drowsiness, or repeated vomiting Headache that is worse lying down, wakes the person, or worsens with straining Sudden severe neck pain with neurological symptoms, suggesting arterial dissection These features can indicate a dangerous cause and take priority over any headache-specific diagnosis. Absence of red flags supports outpatient evaluation and management. Tracking Triggers and Patterns With a Headache Diary A headache diary is one of the most useful tools for post-traumatic headache. Recording the timing, location, quality, and severity of each headache, along with sleep, meals, hydration, menstrual cycle, weather, activity, and medication use, reveals the patterns and triggers that guide treatment. Over a few weeks, a diary shows whether headaches cluster around specific triggers, whether medication use is creeping toward overuse, and which phenotype dominates. Bringing this record to a clinician sharpens the diagnosis and the plan far more than memory alone. Medication Overuse Headache Frequent use of acute headache medication can produce medication overuse headache, where the treatment itself sustains a daily or near-daily headache. This is common after concussion, when frequent pain drives frequent medication use. As a general guide, using simple analgesics on 15 or more days per month, or triptans, combination analgesics, or opioids on 10 or more days per month, raises the risk. Preventive treatment and careful limits on acute medication, guided by a clinician, break the cycle. Why Location and Triggers Matter for Diagnosis Post-traumatic headache is not one condition. Its location, timing, quality, and triggers point toward specific phenotypes, migraine, tension-type, cervicogenic, or a trigeminal autonomic cephalalgia, and each has different treatment. Where the pain sits, what sets it off, and how it behaves are diagnostic clues, not incidental details. A precise diagnosis by a physician, neurologist, or headache specialist, using the criteria of the International Classification of Headache Disorders, directs the person to the treatment most likely to work and avoids prolonged trial and error. A cervical contribution is common across phenotypes and responds to physical therapy alongside medical care. References Ashina, H., et al. (2019). Post-traumatic headache: epidemiology and pathophysiological insights. Nature Reviews Neurology, 15(10), 607-617. PubMed Headache Classification Committee of the International Headache Society (IHS). (2018). The International Classification of Headache Disorders, 3rd edition. Cephalalgia, 38(1), 1-211. PubMed Patricios, J. S., et al. (2023). Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport, Amsterdam, October 2022. British Journal of Sports Medicine, 57(11), 695-711. PubMed