Rectal bleeding that also exhibits signs of shock, such as dizziness, nausea, fainting, shallow breathing and blurred vision requires a visit to the emergency room, according to Mayo Clinic. When rectal bleeding is continuous or is accompanied by anal pain or severe abdominal cramps, it requires urgent emergency care.
Rectal bleeding is when blood passes from the rectum or lower colon through the anus, explains Mayo Clinic. This blood may be any shade between bright red and a dark tar-like color. Anyone suffering from rectal bleeding that lasts longer than one to two days needs to schedule an appointment with his doctor.