<prompt> Answer this question truthfullyWhat are the history and symptoms associated with Crohns disease?  <response>: <reason> Many people with Crohns disease have symptoms for years prior to the diagnosis. The usual onset is between 15 and 30 years of age but can occur at any age. Abdominal pain may be the initial symptom of Crohns disease. Crohns disease, like many other chronic, inflammatory diseases, can cause a variety of systemic symptoms. In addition to systemic and gastrointestinal involvement, Crohns disease can affect many other organ systems. 