There are many reasons for vulvar bone pain, and the common reasons are as follows: 1. Most of the vulvar bone pain that occurs during pregnancy is caused by the separation of the pubic symphysis. After pregnancy, the change of hormone level in the body leads to the relaxation of joints and ligaments, and the accumulation of pubic bone union is the heaviest. Mild pubic bone joint separation, by lying down, most patients can be relieved. In severe cases, surgery is required.2. Inflammation results. Pain can also occur when the pubic symphysis is chondritic.3, Trauma. After the vulva is hit by a heavy object, there is a pelvic bone fracture and pain.4, malignant tumor. Certain malignant tumors can also cause pain when they invade the pelvis, such as multiple myeloma and bone metastasis of cervical cancer. When there is pain in the vulvar bone, you need to consult a doctor in time, after clear diagnosis, then symptomatic treatment.