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 concussion means a severe blow to the head that causes internal or external bleeding in the head along with swelling of the brain. A concussion can last for any amount of time depending on the severity of the injury. Mild concussions last only up to 30 minutes and then slowly the swelling disappears. In some cases, the swelling may last for a day or even for a week. In cases where external bleeding has occurred, the concussion can last as long as the injury or the stitches heal.