Buttock groove pain, the possible causes are hemorrhoids, sedentary, tailbone damage, lumbar muscle strain and so on. 1. hemorrhoids: hip groove pain, may be caused by hemorrhoids, divided into internal hemorrhoids, external hemorrhoids and mixed hemorrhoids, may lead to hip groove pain. 2. Sedentary: If you sit for a long time, or sit in a poor posture, it may cause strain on the buttock muscles, which may lead to pain in the gluteal groove. 3. Damage to the tailbone: If there is a recent fall or the tailbone is hit by an external force, it may cause the tailbone to be fractured or damaged, resulting in pain in the gluteal groove. 4. Lumbar muscle strain: mostly due to the accumulation of lumbar muscles, ligaments, fascia and other soft tissues, chronic injuries, not timely and effective treatment, after the transformation into chronic disease, caused by aseptic inflammation, usually manifested as lumbar pain, can be radiated to the buttocks, the emergence of gluteal groove pain phenomenon. Buttock groove pain may also have other reasons, it is recommended to go to the regular hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.