The symptoms can be due to deficiencies caused by chronic
diarrhea and possibly infection persisting due to low immunity. Treating
diarrhea may help control the symptoms. Chronic diarrhea can be due to parasitic infestations. Other causes are irritable bowel syndrome, celiac disease, Crohn’s disease, malabsorption syndromes, pancreatic diseases, diabetes, hyperthyroidism etc. If celiac, Crohn’s and other problems have been ruled out then lactose intolerance and IBS are the possibilities.