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Cluster headaches, which occur in cyclical patterns or clusters, are one of the most painful types of headache.

A cluster headache commonly awakens you in the middle of the night with intense pain in or around one eye on one side of your head.

Bouts of frequent attacks, known as cluster periods, can last from weeks to months, usually followed by remission periods when the headaches stop.

During remission, no headaches occur for months and sometimes even years.

Migraine is a common neurologic syndrome characterized by severe headache, nausea, vomiting, and hypersensitivity to lights and sounds.

Other common symptoms include chills, sweating, fatigue, weakness, loss of appetite, numbness or tingling, and difficulty speaking or concentrating.

Some patients experience warning signs, such as visual disturbances or aura, a few minutes or a whole day before an attack, which may last 4 to 72 hours.

The precise causes and mechanisms of migraine are unknown. Attacks originate with chemical changes in the brain and nervous system and progress into painful restrictions in blood flow.

Certain tastes, odors, lights, noises, and physical or emotional stress may trigger migraine. During the first phase of a Migraine Headache blood flow may be reduced by an average of 36%. The specific symptoms that are experienced as a result of this reducuction -such as visions of flashing lights-depend on which area of the brain is affected.

Reduced blood flow results in a lack of oxygen in the tissues, along with changes in the brain's chemistry. This, in turn, causes the release of substances that greatly dilate the blood vessels. Local tissue injury and swelling occur as a result. It is at this time Migraine pain strikes the patient.