What are the most common causes of occult blood in stool?

The most common causes of occult blood in the stool include conditions such as hemorrhoids, anal fissures, ulcers in the digestive tract (such as peptic ulcers or ulcerative colitis), diverticulosis, and gastrointestinal bleeding caused by tumors or polyps. Other possible causes include gastrointestinal infections, such as bacterial or parasitic infections, inflammatory bowel disease, and certain medications that can irritate the digestive tract. It is important to consult with a healthcare professional for a proper evaluation to determine the specific cause of occult blood in your stool.