Pain below the navel may be caused by cystitis, pelvic inflammatory disease, intestinal obstruction and other diseases. 1. Cystitis: Cystitis may be caused by bacterial infection, low immunity, drugs, sexual impurity and other factors. Patients may experience frequent urination, urinary urgency, lower abdominal pain, hematuria, urethral burning and other symptoms, which may be manifested as pain below the navel. 2. Pelvic inflammatory disease: Pelvic inflammatory disease may be caused by pathogen infection, poor hygiene, sexually active and other factors. Symptoms include lower abdominal pain, increased vaginal discharge, fever, chills, etc., and patients may experience pain below the navel. 3. Intestinal obstruction: The causes of intestinal obstruction include intestinal adhesion, tumor, hernia, intussusception and so on. Patients may experience abdominal pain, vomiting, abdominal distension and other symptoms, and some patients may experience pain below the navel. There are many other causes of pain below the navel, such as skin lesions (e.g. herpes zoster, etc.), trauma and so on. Patients can combine their own situation, go to the regular hospital, so as to identify the cause of the disease. After diagnosis, you need to actively cooperate with the doctor to take relevant treatment measures.