My husband is having a passage of fresh blood often when he is defacating hard stool. The doctor made rectal exam with negative findings. Wat cn ths b?

Hard stool may be. The cause, and fiber increase can soften, and i suggest dried fruits such as prunes and apricots. If bleeding occurs with normalizing stool, nd even with what you revealed, endoscopy to assess portions above the finger for polyps, tumors, and diverticuli is in order.
Probably. A missed anal fissure or internal hemorrhoids but also could be a polyp in his colon. See a GI doctor or colon and rectal surgeon for diagnosis. Also correct the hard stool/constipation with high fiber diet and 80-100 oz caffeine free/alcohol free fluid daily.