Cluster headache

Histamine headache; Headache - histamine; Migrainous neuralgia; Headache - cluster; Horton's headache; Vascular headache - cluster 

A cluster headache is a type of headache. It is one-sided head pain that may involve tearing of the eyes, a droopy eyelid, and a stuffy nose. Attacks occur regularly for 1 week to 1 year. The attacks are separated by pain-free periods that last at least 1 month or longer.

Cluster headaches may be confused with other common types of headaches such as migraines, sinus headache, and tension headache.

Brain

The major areas of the brain have one or more specific functions.

Hypothalamus

The hypothalamus is a highly complex structure in the brain that regulates many important brain chemicals. Malfunction of this area of the brain may give rise to cluster headaches.

Cause of headaches

Cluster headaches may be caused by blood vessel dilation in the eye area. Inflammation of nearby nerves may give rise to the distinctive stabbing, throbbing pain usually felt in one eye. The trigeminal nerves branch off the brainstem behind the eyes and send impulses throughout the cranium and face.

Pain of cluster headache

The symptoms of a cluster headache include stabbing severe pain behind or above one eye or in the temple. Tearing of the eye, congestion in the associated nostril, and pupil changes and eyelid drooping may also occur.

Causes

Symptoms

Exams and Tests

Treatment

Outlook (Prognosis)

When to Contact a Medical Professional

Prevention