Consider vesicoureteral disease or gastrointestinal disease for vague pain right in the middle of the lower abdomen. Consider conditions such as prostatitis in men and pelvic inflammatory disease in women. 1. Vesicoureteral diseases: If the patient has a vague pain in the middle of the lower abdomen, accompanied by frequent urination, urinary urgency, urinary pain and other symptoms, consider the possibility of acute cystitis or ureteral end stones. 2. Digestive tract diseases: colon polyps, rectal cancer, small bowel lesions, acute gastroenteritis and other diseases may also appear in the lower abdomen in the middle of the hidden pain; if the small bowel lesions or acute gastroenteritis, accompanied by nausea, vomiting, diarrhea and other symptoms. If the abdominal pain is accompanied by cessation of bowel movement, it may be due to intestinal obstruction. Patients with prostatitis in men, pelvic inflammatory disease in women, and endometritis in uterus may also have symptoms of occult pain in the middle of the lower abdomen. Patients with vague pain in the middle of the lower abdomen should go to the hospital in time for definitive treatment.