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◎ Medicine & Health·2 min·Updated Mar 15, 2026

What is Cluster Headache?

Cluster Headache

Quick Answer

A cluster headache is a type of severe headache that occurs in cyclical patterns or clusters. It is known for causing intense pain, often around one eye, and can be accompanied by other symptoms like nasal congestion or tearing.

Overview

Cluster headaches are extremely painful and can occur in groups or 'clusters,' which is where they get their name. These headaches often strike suddenly and can last from 15 minutes to three hours, making them one of the most intense forms of headache. People experiencing a cluster headache may find it difficult to sit still, often pacing or rocking back and forth as a way to cope with the pain. The exact cause of cluster headaches is not fully understood, but they are believed to be related to the body's biological clock, or circadian rhythms. This means they can occur at specific times of the year or during certain times of the day, often waking people from sleep. For example, someone might have a series of cluster headaches every night for a few weeks, only to have them disappear for months before returning. Understanding cluster headaches is important because they can significantly impact a person's quality of life. Many individuals who suffer from them may avoid social situations or activities they enjoy, fearing an attack might occur. Recognizing the symptoms and seeking treatment can help manage the pain and reduce the frequency of episodes, making it crucial for those affected to seek medical advice.

Frequently Asked Questions

Symptoms typically include severe, sharp pain around one eye, which may be accompanied by redness or tearing of the eye. Other symptoms can include nasal congestion, sweating, and restlessness.
Treatment options often include medications to relieve pain during an attack and preventive treatments to reduce the frequency of headaches. Oxygen therapy and certain medications like triptans can be effective in managing symptoms.
Cluster headaches can affect anyone, but they are more common in men than women and often start in young adulthood. Family history may play a role, as those with relatives who have cluster headaches are at a higher risk.