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. Concussion can trigger SUNCT syndrome, a rare trigeminal autonomic cephalalgia of ultrashort, extremely frequent stabbing one-sided attacks around the eye with prominent tearing and redness (Ashina et al., 2019). SUNCT stands for short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing. The attacks are ultrashort, lasting seconds to a couple of minutes, and strike many times an hour with a stabbing or electric quality, always accompanied by same-side eye redness and tearing. After trauma, disruption of trigeminal-autonomic and brainstem pathways can produce the pattern. Because SUNCT resists many common headache treatments, specialist diagnosis is essential to direct the specific therapies that help. SUNCT produces ultrashort, extremely frequent stabbing one-sided attacks. Prominent same-side tearing and redness accompany every attack. It resists common treatments, so specialist diagnosis is essential. What SUNCT Syndrome Is SUNCT syndrome is one of the trigeminal autonomic cephalalgias, and among the most distinctive because of its extreme brevity and frequency. The full name describes it: short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing. Each attack is a burst of severe, stabbing, burning, or electric pain on one side, around or behind the eye or in the forehead and temple, lasting only seconds to a couple of minutes. Every attack comes with prominent same-side autonomic features, especially conjunctival injection, the reddening of the eye, and tearing. The attacks are strikingly frequent, occurring many times an hour and sometimes more than a hundred times a day during active periods. A closely related condition, SUNA, has similar attacks with a different pattern of autonomic features. Both belong to the short-lasting neuralgiform group and share the ultrashort, high-frequency character. Mechanism and the Trigeminal-Autonomic Reflex SUNCT, like the other trigeminal autonomic cephalalgias, involves activation of the trigeminal-autonomic reflex, which couples severe trigeminal pain with the cranial autonomic response of tearing and redness. Imaging implicates the hypothalamus and brainstem in generating the attacks. The neuralgiform, stabbing quality and the ultrashort duration reflect the particular way these pathways fire in SUNCT, producing rapid, repetitive bursts rather than the longer attacks of cluster headache or the continuous pain of hemicrania continua. Because the pain is neuralgiform and can be triggered by touching the face or by movements such as chewing, SUNCT can resemble trigeminal neuralgia. The prominent autonomic features and the specific attack pattern distinguish it, and this distinction matters because the treatments differ. How Concussion Can Trigger It Head trauma is a recognized trigger for SUNCT syndrome. The injury can disrupt the trigeminal-autonomic and brainstem pathways that generate the ultrashort attacks. Post-traumatic SUNCT appears after the injury and carries the same defining features, the ultrashort, extremely frequent stabbing attacks with tearing and redness. Given the involvement of the hypothalamic and pituitary region in these disorders, evaluation of post-traumatic SUNCT pays particular attention to excluding a structural lesion in that area. Symptom Presentation Ultrashort attacks lasting seconds to a couple of minutes Stabbing, burning, or electric one-sided pain around the eye or forehead Extremely frequent attacks, many per hour Prominent same-side eye redness and tearing with every attack Attacks sometimes triggered by touch or facial movement Onset after a head injury Poor response to common headache treatments Assessment A neurologist or headache specialist diagnoses SUNCT from the characteristic pattern of ultrashort, frequent, one-sided neuralgiform attacks with conjunctival injection and tearing, using the International Classification of Headache Disorders criteria. Brain imaging, with particular attention to the pituitary and posterior fossa region, is important to exclude a structural cause, especially after head injury. The specialist distinguishes SUNCT from trigeminal neuralgia by the prominent autonomic features and attack pattern, and from other trigeminal autonomic cephalalgias by attack duration and frequency. Treatment Approach SUNCT is notoriously resistant to standard headache treatments, which is why specialist management is essential. Certain specific medications used for this disorder can reduce attacks, and a specialist selects and titrates them, sometimes using an intravenous bridging treatment to gain rapid control during severe periods. Because SUNCT does not respond to the treatments that help migraine or even other trigeminal autonomic cephalalgias, using the wrong treatment wastes time in a highly distressing condition. Excluding a structural cause is a priority given the association with lesions in the pituitary region. Alongside the specific medical therapy, addressing cervical and autonomic contributors and protecting sleep supports overall stability, and avoiding medication overuse prevents a superimposed daily headache. The central requirement is specialist care with the specific treatments that target this uncommon and treatment-resistant disorder. 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 Mistaking SUNCT for trigeminal neuralgia and missing the autonomic pattern Using migraine or cluster treatments that do not work for SUNCT Failing to image the pituitary region to exclude a structural cause Delaying specialist referral for a treatment-resistant disorder Allowing medication overuse to add a daily headache Progression A specialist confirms the ultrashort, frequent neuralgiform pattern with autonomic features, excludes a structural cause with imaging of the pituitary region, and distinguishes SUNCT from trigeminal neuralgia and other trigeminal autonomic cephalalgias. Specific medications reduce attacks, sometimes with a bridging treatment for rapid control. Cervical, autonomic, and sleep support supplement care under ongoing specialist management. What is SUNCT syndrome? SUNCT stands for short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing. It is a rare trigeminal autonomic cephalalgia of ultrashort attacks lasting seconds to a couple of minutes, occurring many times an hour, with stabbing one-sided pain and prominent same-side eye redness and tearing. Can a concussion cause SUNCT syndrome? Head trauma is a recognized trigger. The injury can disrupt the trigeminal-autonomic and brainstem pathways that generate the ultrashort attacks. Post-traumatic SUNCT carries the same features as the primary form, and evaluation pays particular attention to excluding a structural lesion in the pituitary region. How is SUNCT different from trigeminal neuralgia? Both cause brief stabbing one-sided facial pain that touch can trigger, but SUNCT has prominent same-side autonomic features, eye redness and tearing, with every attack, and a distinct attack pattern. Trigeminal neuralgia lacks these prominent autonomic signs. The distinction matters because the treatments differ. Why is SUNCT so hard to treat? SUNCT resists standard headache treatments, including those that help migraine and other trigeminal autonomic cephalalgias. Specific medications used for this disorder can reduce attacks, and a specialist selects and titrates them, sometimes with an intravenous bridging treatment. Using the wrong treatment wastes time in a highly distressing condition. Does SUNCT require brain imaging? Yes. Brain imaging, with particular attention to the pituitary and posterior fossa region, is important to exclude a structural cause, especially after head injury, because lesions in that area can produce a SUNCT-like picture. Imaging is a standard part of the evaluation before settling on the diagnosis. 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 with seizure or loss of consciousness 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. 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. Recognizing medication overuse is essential, because it can mimic or worsen any post-traumatic headache pattern. Why a Precise Diagnosis Matters Post-traumatic headache is not one condition. It takes on the features of recognized primary headache disorders, and each has a specific, sometimes highly specific, treatment. Some headaches respond dramatically to one particular medication, others need targeted preventives, and others improve with cervical and autonomic treatment. 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. Multidisciplinary Care and the Cervical Contribution Post-traumatic headache frequently has more than one driver. A cervical contribution from the neck is common, since the upper cervical joints and nerves refer pain to the head through the trigeminocervical nucleus, the same brainstem region where neck and head pain signals converge. Autonomic dysregulation, sleep disturbance, mood, and medication overuse each add to the picture. Coordinated care works best: a headache specialist or neurologist for diagnosis and medication, a physical therapist for the cervical and postural contribution, and attention to sleep, mood, and autonomic regulation. Treating the neck and nervous system alongside medical management improves many post-traumatic headaches that medication alone does not fully control. 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