Thigh hamstring injuries may present with localized pain, swelling, ecchymosis, and limited movement depending on the individual’s physical condition and severity. Hamstring injuries generally refer to injuries to soft tissues such as tendons, ligaments, muscles, etc. They are usually caused by the sudden contraction of muscles, tendons or ligaments during exercise, resulting in soft tissue tension, limited extension and flexion, or even tearing. 1. Local pain: damage and spasm of soft tissues of thighs can stimulate nerves and trigger local pain. If the muscle contraction is intense, it may lead to avulsion fracture and produce severe pain. 2. Swelling: soft tissue damage occurs aseptic inflammation, resulting in swelling. 3. Ecchymosis: When thighs are strenuously exercised, capillaries can be damaged and blood leaks out from damaged capillaries, causing subcutaneous ecchymosis. 4. Restricted movement: When the muscles, tendons and ligaments of the thighs near the joints are tense or spasmodic, it may lead to restricted movement of the joints. If any of the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.