Thigh pain may be caused by strenuous exercise, lumbar disc herniation, deep vein thrombosis of the lower extremities, etc. 1. Strenuous exercise: If you suddenly go for long-distance running, jumping rope and other strenuous exercise, it may cause excessive accumulation of lactic acid in the leg muscles, which may cause thigh soreness. 2. Lumbar disc herniation: Lumbar disc herniation is a common cause of lower back and leg pain. It is mainly related to disc degeneration, injury, heredity and other factors. If the patient’s lumbar intervertebral disc compresses the nerves in the leg, it may cause the patient’s thigh pain. 3. Lower extremity deep vein thrombosis: Lower extremity deep vein thrombosis refers to blood clotting in the deep veins of the lower extremity to form a thrombus, which is mainly related to venous blood flow stagnation, venous wall damage and other factors. It is mainly characterized by symptoms such as swelling and soreness of the lower limbs. There are many causes of thigh soreness, and it is recommended to seek timely medical treatment and standardized treatment.