Lack of association between five serotonin metabolism-related genes and medication overuse headache.

Serotonin is involved in several central nervous system functions including pain threshold, mood regulation and drug reward. Overuse of acute medications is commonly identified as a causative factor for medication overuse headache (MOH). Apparently, MOH shares with other kinds of drug addiction some common neurobiological pathways.

A case of a GH-producing pituitary adenoma associated with a unilateral headache with autonomic signs.

A 66-year-old man suffered from a drug-resistant, left-sided headache with autonomic signs, triggered by the supine position. The acromegalic facies initially suggested a possible increase in basal plasma levels of GH, but routine haematological controls excluded abnormal values of GH. Cerebral and facial CT scan and MRI did not detect any alterations in the nasal sinuses, except for a mucous cyst.