Nausea, irritability, and difficulty concentrating may be present. Location and characteristics of the pain vary. [merckmanuals.com]

Behavioral headache treatment: history, review of the empirical literature, and methodological critique. Headache. 2005;45 Suppl 2:S92-109. 7. Andrasik F. Behavioral treatment of migraine: current status and future directions. [passeportsante.net]

With treatment, medication overuse headache is probably in remission in about 50% of patients after 10 years. Fewer headache days/month after 1 year of treatment predicts longer remission. [merckmanuals.com]

Transitional (bridge) drugs are used to help prevent withdrawal headache symptoms if withdrawal of the overused drug, use of the rescue drug, and preventive drugs are unlikely to be successful. [merckmanuals.com]