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Updated November 25, 2013.

Definition:

Postdrome is a symptom or set of symptoms that often occurs after a migraine attack is over. It is the fourth and last phase of a migraine.

Though usually less than 24 hours long in duration, the postdrome phase of a migraine may last for hours to even days after a migraine attack.

Postdrome symptoms of a migraine may include fatigue, weakness, irritability, anxiety, depression, difficulty concentrating, and scalp tenderness.