<prompt> Answer this question truthfullyWhat does chronic functional abdominal pain mean?  <response>: <reason> CFAP is characterized by chronic pain, with no physical explanation or findings no structural, infectious, or mechanical causes can be found. It is theorized that CFAP is a disorder of the nervous system where normal nerve impulses are amplified like a stereo system turned up too loud resulting in pain. This visceral hypersensitivity may be a stand-alone cause of CFAP, or CFAP may result from the same type of brain-gut nervous system disorder that underlies IBS. As with IBS, low doses of antidepressants have been found useful in controlling the pain of CFAP. 