Overview
Cluster headaches are a type of primary headache characterized by severe, recurrent attacks of pain, usually on one side of the head. They occur in clusters, with episodes lasting weeks to months, followed by periods of remission.
Symptoms
Symptoms include excruciating pain around or behind the eye, redness in the eye, tearing, runny nose, and facial sweating. Attacks can last from 15 minutes to 3 hours and can occur multiple times a day.
Causes
The exact cause is unknown, but it is thought to be linked to the hypothalamus, which regulates the body's biological clock. Genetics may also play a role.
Treatment
Treatment includes acute medications (oxygen therapy, triptans) and preventive medications (verapamil, lithium). In some cases, nerve blocks or surgery may be considered.
When to See a Doctor
If you experience severe, recurring headaches in a pattern, see a doctor immediately for diagnosis and treatment.