The left side of the buttock hurts when you move, and the following reasons are common: first, gluteal epithelial neuritis, the etiology includes anatomical factors, such as abnormal development of the iliac crest, which causes an increase in the tension of the gluteal epithelial nerve, which is prone to inflammatory changes, and direct or indirect trauma can lead to pulling the gluteal epithelial nerve, which occurs in acute oedema or chronic oedema, and forms an inflammation in the course of time, with the clinical manifestation of pain or numbness in the buttock of the affected side, and sometimes it can be The clinical manifestation is pain or numbness on the affected side of the buttock, sometimes it can be dispersed to the posterior lateral thigh, with obvious localized pressure pain, and sometimes the gluteal epithelial nerve can be touched to show a stripe-like change. Second, gluteus medius muscle injury, clinical manifestations of hip pain, pain and weakness of the affected side of the lower limb when stepping on the ground or support, inspection found that the upper lateral part of the gluteus medius muscle has pressure pain, palpation can feel positive nodules, adhesions, strips, and feel stiffness, muscle tension is greater.