If there are symptoms, the following may indicate colon cancer: 1  Abdominal pain and tenderness in the lower abdomen. 2  Blood in the stool. 3  Diarrhea, constipation, or other change in bowel habits. 4  Narrow stools. 5  Weight loss with no known reason.
Diarrhea may be caused by: lactose intolerance. bacterial infection. damage to intestinal wall. hormone-producing tumors (including certain types of pancreatic neuroendocrine tumors) inflammation or ulceration of the bowel. malabsorption caused by surgery that has shortened the intestines. pancreatic enzyme insufficiency.
Parasitic causes of diarrhea: Introduction. Parasitic causes of diarrhea: Parasitic causes of diarrhea caused by a parasite infection. See detailed information below for a list of 7 causes of Parasitic causes of diarrhea, Symptom Checker, including diseases and drug side effect causes.Â» Review Causes of Parasitic causes of diarrhea: Causes | Symptom Checker Â».arasitic causes of diarrhea: Comorbid Symptoms. Some of the comorbid or associated medical symptoms for Parasitic causes of diarrhea may include these symptoms: 1  Abdominal pain. 2  Abdominal symptoms. 3  Bowel movements.