Unfortunately, there are a variety of different conditions and illnesses that might cause the symptoms that you mention. Allergies or intolerances to certain foods might be one possibility. Chronic infection of the GI tract is another. There are also a couple of rare tumors that can cause symptoms such as these, although they are especially uncommoin in younger people.
I would suggest that, if it has not already been done, that your son be referred to a pediatric GI specialist at a major university teaching hospital in your area.
I hope that your son, and you, can find a doctor who can find the cause, or causes, for your son's health problems, and treat him effectively.
Sincerely/ Robert A. Wascher, MD, FACS
http://doctorwascher.com
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