Below the belly button abdominal pain may be physiological factors, may also be the manifestation of certain diseases, such as gastroenteritis, appendicitis, cystitis, pelvic inflammatory disease and other causes. 1. Physiological factors: women before menstruation or during menstruation may have a hidden pain below the navel performance, adolescent women are mostly seen in primary dysmenorrhea, pay attention to rest and warmth, avoiding cold food and strenuous exercise, usually at the end of the period the pain can be disappeared, without special intervention. 2. Pathological factors (1) Gastroenteritis: If you don’t pay attention to your diet and eat spicy, greasy and irritating food, it may lead to gastroenteritis, which may cause vague pain in the abdomen under the navel. (2) appendicitis: some patients with appendicitis will also produce vague pain in the abdomen below the navel, accompanied by nausea and vomiting, loss of appetite and other symptoms. (3) Cystitis: When bacteria invade the bladder, it may lead to cystitis, which may cause vague pain in the abdomen under the navel. (4) Pelvic inflammatory disease: women with gynecological diseases such as pelvic inflammatory disease may also have symptoms of vague pain in the abdomen below the navel. These are only some of the common causes. If the symptoms persist, you should consult a doctor to identify the specific cause, and if necessary, carry out the appropriate treatment.