||Acid' and 'LSD' are the same thing. LSD is the abbreviation of the chemical name (In German - Lyserg-Saeure-Diaethylamid, or in English - Lysergic Acid Diethylamide). 'Acid' is a common slang term for the same exact chemical. Both terms are used to describe both the pure chemical and the various forms of the chemical when sold on the street (blotter, gel tabs, liquid, etc). |
Some people experience headaches with the use of LSD/Acid and some do not. There is some controversy as to whether there is significant differences in the quality or content of street froms of LSD which could account for some portion of reported side effects, but this is a very technical and poorly studied area.
While it is perhaps slightly more likely that the pure chemical would be referred to by it's chemical name, 'LSD', and the substance as it appears on the street might be slightly more likely to be referred to by slang terms such as 'Acid'...both terms are pretty much interchangeable and nothing can be known about the quality or contents of a particular sample based on which of these two terms someone uses.