Soreness in the left thigh connecting to the femoral head can be caused by lumbar disc herniation, femoral head necrosis, etc. Generally, the soreness can be relieved by improving lifestyle habits, physical therapy, medication, and surgery. 1. Herniated lumbar intervertebral disc: When the structure of lumbar intervertebral disc degenerates and presses on the sciatic nerve, it will cause soreness in the area of the thigh connecting to the femoral head. In order to reduce the pain, you should reduce bending activities, pay attention to keeping the lumbar area warm, and avoid sitting for a long time. Anti-inflammatory and pain-relieving medications such as ibuprofen can also be taken following medical advice. Physical therapy such as infrared laser therapy, magnetic therapy, and microwave therapy can also be performed to promote blood flow in the soft tissues around the femoral head and improve the pain. 2. Necrosis of the femoral head: Necrosis of the femoral head will affect the nerves around the hip joint, causing pain and discomfort. At this time, appropriate energy shock wave and other physical therapy can be used to stimulate blood vessel regeneration, induce bone growth and reduce pain. Drugs such as warfarin can also be used to improve the blood circulation of the muscles around the femoral head. At the same time, avoid weight-bearing activities and pay attention to rest. Hip surgery can also be performed to improve the symptoms of soreness. Different causes of soreness at the femoral head of the thigh can be treated in different ways, so it is recommended to go to the hospital to find out the cause of the problem before treatment.