Diagnosis
Your doctor will start by asking you about your symptoms. Questions may include when you first noticed the bleeding, related symptoms you’re experiencing, and what color the blood is.
Visual or physical exam. The doctor will look or feel to check the affected area. This can include inserting a gloved, lubricated finger into the anus to check for abnormalities, such as hemorrhoids.
Endoscopic procedures. The doctor inserts a thin, flexible lighted scope with a camera into the anus. This allows the doctor to view the area. Examples include a sigmoidoscopy or a colonoscopy.
Blood tests. A complete blood count (CBC) can help assess the extent of the bleeding and show if anemia is present.
Stool tests. These can show if there’s bleeding that isn’t visible.
Gastric lavage. If the doctor suspects the problem may lie in the stomach, they may pass a tube through the nose into the stomach to remove the contents and try to locate the site of any bleeding.
Imaging tests. This could be a scan or an X-ray, possibly with a contrasting agent, such as barium.