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.
Concussion Symptoms . It is not always easy to know if someone has a concussion. You don't have to pass out (lose consciousness) to have a concussion. Symptoms of a concussion range from mild to severe and can last for hours, days, weeks, or even months. If you notice any symptoms of a concussion, contact your doctor. Symptoms of a concussion fit into four main categories: