With chronic pain, it continues even when the original physical condition has resolved. The continuing severity of pain and disability experienced by the patient typically cannot be explained by results on medical tests or scans. The most common pediatric conditions with chronic pain include: complex regional pain syndrome, recurrent abdominal pain, generalized chronic pain, migraine headache, concussion, sickle cell disease and Ehlers Danlos Syndrome, a connective tissue disorder. Other diagnoses may include fibromyalgia, myofascial pain syndrome, neuropathic pain and psychogenic pain. Recently the term "Pain Amplification Syndrome" or "AMPS" has been used to describe some of these conditions in which, for unknown reasons, the central nervous system interprets normal sensations from movement and touch as pain.