If you have a vague pain in your abdomen, you should be alert to the fact that it may be caused by cystitis, prostatitis, colitis, etc., and you should consult a doctor in time to find out the cause of the problem. 1. Cystitis: There are many causes of bladder inflammation, including pathogenic infections. It can cause a vague pain in the abdomen, usually accompanied by frequent urination, urinary urgency, urinary pain, and even urinary incontinence in severe cases. 2. Prostatitis: a common disease in adult men, and abdominal pain is one of the typical clinical manifestations of prostatitis, pain may also appear in the perineum, inner thighs, groin, testicles, penis, around the anus, and even lumbar-sacral and other places; and there can be frequent urination, urgency, pain, incomplete urination, urinary dribbling, and even itchy urethra as well as abnormal secretion and other manifestations. 3. Colitis: inflammatory lesions of the colon caused by a variety of reasons, common symptoms include increased stool frequency, loose stool, abdominal pain (pain attacks in the left abdomen or abdomen), abdominal distension, mucus, pus, blood, some people also have a fever. This symptom alone is not enough to determine the disease, causing vague pain in the abdomen for more reasons, may also be appendicitis, pelvic inflammatory disease and so on. It is recommended to consult a doctor to clarify the cause of the disease and give targeted treatment.