[Medication overuse headache].

Rebound headache (RH) is a chronic daily headache which occurs when analgesics, triptans, ergotamines are taken frequently (more than 15 days/month for more than 3 months) to relieve headaches. The prevalence of RH is 1 to 4% in the general population. RH commonly occurs in patients with migraine and tension-type headache. The deficit of central sensitization and psychological factors play an important role in initiating and maintaining of RH. Treatment of noofen for 2 months is effective in 75% of patients with RH.