Definition | Causes | Risk Factors | Symptoms | Diagnosis | Treatment | Prevention

Definition

Cluster headache is a type of severe, recurring pain that is located on one side of the head. It received its name from the clustering, or pattern, of frequent headaches that usually occur.

There are two main types of cluster headaches:

  • Episodic cluster headaches—These occur one or more times daily for multiple weeks. The headaches then enter a period of remission and come back months or years later.
  • Chronic cluster headaches—These occur almost daily with headache-free periods lasting less than one month.

Either type of headache may convert to the other type.

Causes

The cause of cluster headaches is not known. It is thought that there is abnormal activation of the area of the brain that is responsible for regulating temperature, blood pressure, hormone release, and sleep. The pain is thought to be caused by a combination of widening of the blood vessels and inflammation of the nerves of the face.

Other possible causes include:

Risk Factors

Factors that increase your chance of getting cluster headaches include:

  • Sex: males
  • Age: 20-50 years old
  • Prior head surgery or head injury
  • Positive family history of cluster headaches

Symptoms

Symptoms of cluster headache include:

During the headache, other symptoms may occur on the affected side, including:

  • Stuffy or runny nose
  • Redness or watering of the eye on one side
  • Droopy eyelid
  • Constriction of the pupil of the eye
  • Facial swelling and flushing, sweating
  • Sensitivity to light and noise

Symptoms of a Cluster Headache

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Diagnosis

The doctor will ask about your symptoms and medical history. A physical and neurological exam will be done. A neurological exam may include examining:

  • Mental status
  • Cranial nerve functioning
  • Motor and sensory functioning
  • Reflexes
  • Coordination
  • Walking

The doctor will ask about the frequency and pattern of your headaches. To help provide answers, you may consider keeping a diary of:

  • When your headaches started and ended
  • What you were doing at the time
  • What you tried to relieve the pain

Pictures may be taken of your brain to rule out other disorders. This can be done with:

Treatment

Treatment aims to reduce the frequency of headaches and help relieve pain.

Drugs used to treat migraines often relieve sudden attacks of cluster headaches. These drugs must be taken at the first sign of a headache.

Drugs used to treat cluster headaches include:

  • Triptans given as a pill, injection, or nasal spray
  • Octreotide given as an injection
  • Corticosteroids, such as prednisone
  • Lidocaine nose drops or spray
  • Dihydroergotamine
  • Ergotamine
  • Pain relievers with caffeine
  • Glycerol given as an injection into the nerve—used when other treatments do not help

In some cases, the headache does not last long enough for drugs to be helpful. Sometimes, the drugs just delay an attack, rather than stop an attack.

Pain killers, especially narcotic drugs, should not be used during an acute attack.

Other medicines may be given to prevent or reduce the frequency of headaches. Examples of these drugs include:

  • Intranasal civamide and capsaicin cream
  • Steroids—oral or via injections
  • Verapamil
  • Lithium
  • Melatonin
  • Valproate or gabapentin
  • Methysergide
  • Dihydroergotamine or a triptan
  • Topiramate
  • Baclofen
  • Beta-blockers
  • Clonidine
  • Amitriptyline
  • Selective serotonin reuptake inhibitors (SSRIs)

Breathing 100% oxygen for 10-15 minutes often relieves cluster headache pain. This is often viewed as the front-line therapy for cluster headache. The oxygen appears to decrease blood flow to the affected area of the brain. People under age 50 who have episodic cluster headaches seem to benefit most from oxygen therapy.

Oxygen therapy can be expensive, and there are risks with this therapy.

As a last resort, some doctors may recommend cutting or destroying a facial nerve to eliminate pain.

Prevention

To prevent cluster headaches from getting worse, preventive medicine may be given. In addition: