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Cluster Headache: Causes, Symptoms and Treatment

Cluster headache is a rare but extremely painful headache disorder with stabbing pain around one eye, occurring in cyclical attack periods.

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Things worth knowing about "cluster headache"

Cluster headache is a rare but extremely painful headache disorder with stabbing pain around one eye, occurring in cyclical attack periods.

What is Cluster Headache?

Cluster headache is one of the most painful conditions known in medicine. It belongs to the group of trigeminal autonomic cephalalgias and is characterized by recurrent, severely intense headache attacks on one side of the head, typically centered around or behind one eye. The pain is often described as stabbing, burning, or drilling in nature and can be completely debilitating during an attack.

Causes

The exact cause of cluster headache is not yet fully understood. Current research suggests that dysfunction of the hypothalamus (a brain region that regulates biological rhythms) plays a key role. The trigeminal nerve and the autonomic nervous system are also involved.

Hypothalamic activation as a likely trigger mechanism
Involvement of the trigeminal nerve and cranial nerves
Genetic predisposition (family history known in some cases)
Triggers during active periods: alcohol, nicotine, strong odors, sleep disturbances

Symptoms

Attacks typically last between 15 minutes and 3 hours. They often occur at the same time each day, frequently during the night, and can cluster over weeks or months (hence the name cluster headache).

Severe, one-sided pain around the eye, temple, or forehead
Red, watering eye on the affected side
Nasal congestion or runny nose
Drooping eyelid (ptosis)
Restlessness and agitation during attacks
Facial sweating on the affected side

Diagnosis

Diagnosis is primarily clinical, based on a thorough medical history and neurological examination. Imaging studies such as MRI (magnetic resonance imaging) or CT (computed tomography) are used to rule out other causes such as tumors or vascular abnormalities. The International Headache Society (IHS) has defined clear diagnostic criteria for cluster headache.

Detailed medical history and pain diary
Neurological examination
MRI or CT to exclude organic causes

Treatment

Acute Treatment

The following options are available for rapid relief during an attack:

Oxygen inhalation: High-flow pure oxygen (100%) via a mask is one of the most effective acute treatments.
Triptans: For example, subcutaneous sumatriptan provides fast pain relief.
Nasal lidocaine: A local anesthetic administered into the nostril.

Prevention (Prophylaxis)

To reduce the frequency and severity of attacks, the following medications are used:

Verapamil: A calcium channel blocker and the first-line preventive medication
Corticosteroids: Used short-term to rapidly break an active cluster period
Lithium: Particularly useful in chronic cluster headache
CGRP antibodies: A newer treatment option (e.g., galcanezumab)

Advanced Treatment Options

In severe, treatment-resistant cases, deep brain stimulation of the hypothalamus or occipital nerve stimulation may be considered.

When to See a Doctor?

Anyone experiencing an extremely severe, one-sided headache for the first time -- especially with eye symptoms -- should seek medical attention immediately. Even patients with a known diagnosis should receive regular neurological follow-up care.

References

Headache Classification Committee of the International Headache Society (IHS): The International Classification of Headache Disorders, 3rd edition. Cephalalgia, 2018.
May A. et al. - EFNS guidelines on the treatment of cluster headache and other trigeminal-autonomic cephalalgias. European Journal of Neurology, 2006.
Deutsche Migräne- und Kopfschmerzgesellschaft (DMKG): Guidelines on Cluster Headache and Trigemino-Autonomic Headaches, 2015.

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