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Cluster headache is a very painful type of headache. It usually occurs in periods of frequent attacks known as clusters. Cluster headaches can wake people from sleep. These headaches cause intense pain in or around one eye on one side of the head.
Cluster periods can last from weeks to months. Then usually the headaches stop for a period of time, which may last for months or years.
Cluster headache is rare. Treatments can shorten cluster he...

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Common symptoms

A cluster headache strikes quickly. There's usually no warning. But some people might first have migraine-like nausea and aura. Common symptoms during a cluster headache include:
- Extreme sharp or stabbing pain, usually in, behind or around one eye. The pain can spread to other areas of the face, head and neck.
- Pain on one side of the head in a single cluster. Pain can switch to the other side in another cluster....

Experts don't know what causes cluster headache. Cluster headache patterns suggest a link to the area of the brain that helps run the body's biological clock, known as the hypothalamus.
Cluster headache triggers

There are several cluster headache triggers. The most common is drinking alcohol. Other triggers might include weather changes and certain medicines.

There's no cure for cluster headaches. The goal of treatment is to decrease the pain, shorten the headache period and prevent new attacks.
Because the pain of a cluster headache tends to come on suddenly and go away quickly, it can be hard to treat. Treatment requires fast-acting medicines.
Fast-acting treatments

These treatments aim to stop a cluster headache once it's begun:...

For informational purposes only and not a substitute for professional medical advice, diagnosis, or treatment.