1 The scientific name for caffeine is 1,3,7-trimethylxanthine. 2  Caffeine is considered to be the most commonly used psychoactive drug in the world. 3  Coffee, soda, and tea are the most common sources of caffeine in the American diet.  Discontinuation of regular caffeine use may produce withdrawal symptoms.
For most patients, post concussion symptoms go away within a few days to several weeks after the original injury occurs.[In others, symptoms may remain for three to six months.In a small percentage of patients, symptoms may persist for years or may be permanent.
A Univ. of Nev. School of Medicine, Family Medicine answered. How long a cluster headache lasts varies widely from person to person. Some people may experience several cluster headaches in the course of a day, lasting 15 minutes to 180 minutes. Or they may experience one cluster headache every other day, lasting 180 minutes, or anything in between that.