Pain in the left pubic bone should alert you to herniated lumbar discs, pelvic inflammatory disease, and colitis. It may also be caused by trauma. 1. Lumbar disc herniation: it may be a problem in the lumbar spine, lumbar disc herniation compresses the nerves. Numbness and weakness of the lower limbs, radiating pain, and left pubic bone pain will occur. 2. Pelvic inflammatory disease: Pelvic inflammatory disease is a group of diseases caused by infections in the upper reproductive tract of women. If a woman has pain in her left pubic bone, it may be a manifestation of pelvic inflammatory disease caused by gynecology. Pelvic inflammation caused by the pubic bone pain is usually accompanied by obvious abdominal pain and anal dilatation. 3. Colitis: various inflammatory lesions occurring in the colon are also prone to irritation, which can cause significant pain and pressure on the left side of the pubic bone, and can also easily lead to the occurrence of blood in the stool after a serious situation. 4. Trauma: In the event of localized trauma, the periosteum of the pubic bone or bone damage may be caused, resulting in significant pain on the left side of the pubic bone. When the left pubic bone pain, should go to the hospital in time to check, clear the cause of the disease, under the guidance of the doctor targeted treatment.