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 diagnosis may be made when symptoms resulting from concussion last for more than three months after the injury. Loss of consciousness is not required for a diagnosis of concussion or post-concussion syndrome. The condition is associated with a wide range of symptoms: physical, such as headache; cognitive, such as difficulty concentrating; and emotional and behavioral, such as irritability.