The vague pain on the right side of the female pelvis is commonly caused by the following reasons: first, iliac crest periostitis: it is mainly caused by the compression of the iliac crest, especially in patients who take a lateral position at night, because the iliac crest is in contact with the bed for a long time, the periosteum of the iliac crest will be compressed over time, and the periosteum will become inflamed, so the vague pain on the right side of the pelvis will occur. Second, muscle injury: it may be caused by the hip capsule or the surrounding soft tissue injury, which may be due to a lot of sports during the day, causing local muscle strain or ligament strain, which can cause pain and soreness on the right side of the hip joint. Third, femoral head necrosis: mainly due to a lot of smoking, drinking, or due to the long-term use of hormones in certain diseases, there will be femoral head necrosis, which is manifested as pain in the right side of the hip joint, and deep pain in the hip joint.