A cluster headache is a neurological disorder characterized by recurrent severe headaches on one side of the head. It has been described as "probably one of the most painful conditions known to mankind".^[1]

Further reading

Sharma, Sid, Clare Donaldson & Michael Plant (2020) Problem area report: pain, Happier Lives Institute, November, pp. 26–28.

Related entries

pain and suffering

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Matharu, Manjit S. & Peter J. Goadsby (2004) Cluster headache: focus on emerging therapies, Expert Review of Neurotherapeutics, vol. 4, pp. 895–907.