Pain around the navel accompanied by lumbar pain may be due to trauma, gastrointestinal diseases, urinary system diseases, reproductive system diseases, lumbar spine diseases and other reasons. 1. Trauma: falling from a height, car accidents, etc. lead to abdominal and lumbar region by violent impact, extrusion, concussion and other traumatic injuries, resulting in abdominal wall injuries, pelvic and abdominal tissues damage, etc., and thus will be pain around the navel accompanied by lumbar pain. 2. Gastrointestinal diseases: gastrointestinal dysfunction, inflammatory bowel disease, intestinal tuberculosis, colon cancer, appendicitis and other diseases will not only appear periumbilical intestinal lesions, but also may involve the neighboring lumbar area, resulting in pain around the navel accompanied by low back pain. 3. Urinary system diseases: pyelonephritis, ureteral stones, ureteral tuberculosis, cystitis and other diseases will not only appear urinary symptoms such as frequent urination, urinary urgency, urinary pain, but also may appear around the umbilicus, lumbar pain. 4. Reproductive system diseases: female pelvic inflammatory disease, ovarian cancer, ectopic pregnancy, endometriosis and other lesions may also involve the umbilical and lumbar region, resulting in pain. 5. Lumbar spine diseases: lumbar spine tuberculosis, lumbar disc herniation, ankylosing spondylitis and other diseases that compress and stimulate the spinal nerves leading to lumbar radiating pain may involve the umbilical region. Pain around the navel accompanied by low back pain may be related to a variety of factors, it is recommended to consult a doctor for a clear diagnosis.