After defecating, there is bright red blood on the paper. What's going on?

1.

Hemorrhoids When

defecating, hemorrhoids may rupture and bleed due to pressure. Blood is usually bright red, and may appear on toilet paper when wiping.

2.

Excessive anal opening during anal fissure defecation may lead to anal fissure, resulting in bright red blood on stool paper due to skin or mucosal fissures near the anus.

3. Ulcerative colitis

Ulcerative colitis may cause damage to the intestinal mucosa of patients, resulting in bright red blood during defecation.