Mnemonic for CLUSTER headaches
Cluster headaches are typically clustered in bouts of about 7 days, except for chronic variant.

C – Conjunctival injection (bloodshot eyes). Conjunctival injection = A popular term for eyes that appear red due to dilation of the conjunctival vessels overlying the sclera.

L  – Lacrimation, nasal congestion or rhinorrhea,  forehead and facial sweating, miosis or ptosis

U – Unilateral or ipsilateral.

S – Severe or very severe unilateral orbital, supraorbital, or temporal pain lasting 15 to 180 minutes if untreated

T – Triptan injection work. Oxygen and CCB work too.

E – Eyelid drooping (ptosis) or eyelid swelling.

R – Restlessness or agitation

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