Thigh root tendon pain may be caused by trauma, deep vein thrombosis, and sciatic nerve compression. 1. Trauma: If the patient has had a straddle injury, it may damage the tendons at the root of the thigh, leading to thigh root tendon pain. 2. Deep vein thrombosis: If the patient is sedentary or bedridden for a long period of time, there may be deep vein thrombosis, and deep vein thrombosis will cause leg pain that radiates to the thigh root. 3. Sciatic nerve compression: If the patient has a history of trauma to the buttocks or thighs, this may lead to compression of the sciatic nerve after the injury, causing thigh root tendon pain. Thigh root tendon pain may also be caused by other reasons, such as fasciitis, etc. It is recommended to consult a doctor in time for a clear diagnosis and treatment.