I am sorry to hear about your dad's medical issues, and I can certainly understand why they are distressing. In order to provide an accurate answer, I would need to be able to review your dad's entire medical history, including prior testing, and also perform a thorough physical exam. Only after collecting this information would it be possible to make recommendations on potential causes of his symptoms as well as treatment options. I strongly encourage your dad to schedule an appointment with a gastroenterologist
to discuss these issues.
Diarrhea can be caused by many different conditions. Infections, either from a bacterium, virus, or parasite, can all cause diarrhea. Autoimmune disorders, such as Crohn's disease and ulcerative colitis, can cause diarrhea that contains blood. Other disorders, such as irritable bowel syndrome, can cause both diarrhea and constipation. Hemorrhoids
and anal fissures can cause blood in the stool. However, it is also important to rule out colon cancer in patients with rectal bleeding
. Other issues, such as peptic ulcer disease, esophagitis, arteriovenous malformations, and gastritis can cause bleeding in the GI tract.
In order to evaluate your father for these conditions, he will need to see a gastroenterologist. He may need to undergo additional testing, such as a colonoscopy, upper endoscopy, or stool testing.