What causes intermittent sharp pain from the lower abdomen to the anus?

Sharp pain from the lower abdomen to the anus may be caused by various factors, including: 1. Anal fissure: Caused by tearing or rupture of the skin around the anus, associated with chronic constipation, diarrhea, infection, and other factors. Characteristics include pain, fever, and itching. 2. Acute gastroenteritis: Intestinal inflammatory response caused by consuming contaminated food, resulting in sharp pain from the lower abdomen to the anus. 3. Anal fistula: A pus-forming ulcer on the skin near the rectum or anal canal, with pain radiating to surrounding areas, causing sharp pain from the lower abdomen to the anus. 4. Other diseases: Conditions such as intestinal colic, proctitis, pelvic inflammatory disease, prostatitis, perianal abscess, and rectal malignancies may also cause similar symptoms. If such symptoms occur, timely medical consultation is recommended for diagnosis and treatment by a qualified physician.