The left side of the right palm is generally referred to as the piriformis. The causes of piriformis pain generally include muscle strain, cervical spondylosis, and lesions of the nerves around the piriformis. 1. Muscle strain: Frequently grasping objects with hands or keeping a posture for too long will cause muscle strain, resulting in pain around the piriformis. 2. Cervical spondylosis: compression of the eighth cervical nerve by cervical spondylosis can also lead to pain in the piriformis, and in some cases, numbness and weakness in finger gripping can occur. 3. Lesions of the nerves around the piriformis: Irritation of the inner elbow joint and ulnar side of the palm can cause ulnar neuropathy, resulting in piriformis pain. In addition, pain in the pisiform area can also be caused by periosteal lesions around the fifth metacarpal bone, elbow canal syndrome and other diseases. If the pain on the left side of the right palm continues to be unrelieved, it is recommended to seek medical attention and follow the doctor’s instructions.