When the navel hurts when pressed, there are three possible diseases: 1. Umbilical ureteral cyst: This is manifested as a swelling at the navel, which is often painful when pressed. If combined with infection, the skin of the navel will become red and break down. It is recommended that the patient visit the urology department, and surgery is required after a clear diagnosis. 2. Navel infection: If the patient repeatedly scratches the navel, it will cause the skin of the navel to become red and painful when pressed. Local disinfection and oral antimicrobial therapy are needed. 3, umbilical hernia: when the patient increases abdominal pressure, the abdominal contents protrude from the navel, manifesting as a swelling at the navel and often painful when pressed. Patients are advised to improve ultrasound examination, and surgery is required after the umbilical hernia is clearly identified.