Pain in the hip bone with menstruation can be caused by several things: i. It can be caused by inflammation associated with the production of the hip bone. ii. Inflammation can be new inflammation or old, pre-existing inflammation. For example, if the patient’s resistance is weak during menstruation, and if the area is exposed to cold, new inflammation will occur, resulting in bone pain. If the patient has previous inflammation in this area, such as inflammation within the sacroiliac joint or hip joint, during menstruation, due to the increase of inflammatory mediators in the body, it is possible that the inflammation in the above mentioned area will be aggravated, which in turn leads to pain. Second, it may be caused by dysmenorrhea. If dysmenorrhea occurs during the patient’s menstrual period, radioactive pain may appear in the lumbosacral region, causing the patient to mistakenly believe that there is bone pain. Third, may be due to a long time sitting or lying down. During menstruation, some patients are used to curling up in one place for a long time, which will cause long-term pressure on the hip bone over time, producing aseptic inflammation and leading to pain.