What is it?

Trigeminal Autonomic Cephalgias (TACs) are a relatively rare group of primary headache disorders which affect only one side of the head, in accordance with the trigeminal nerve distribution. The headache is associated with cranial autonomic features of the same side of the headache.The group comprises cluster headache, paroxysmal hemicrania, hemicrania continua, and short lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCT syndrome).

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Signs & symptoms

Symptoms may include headache, conjunctival injection, lacrimation, nasal congestion, rhinorrhea, facial sweating, ptosis and eyelid edema of the same side of the headache.


Diagnosis is based upon findings from medical history and physical examination. Further evaluation may include an MRI scan.


Treatment depends on the exact condition but may include triptans, oxygen therapy, topical lignocaine, ergotamine, analgesics such as opiates and non-steroidal anti-inflammatory drugs, beta blockers, steroids, methysergide, lithium, and even surgery.

☝️ This is not a substitute for professional medical advice. Please consult with your physician before making any medical decision.

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