Inner thigh and calf tendon pain is mostly considered to be caused by muscle strain, pear-shaped muscle syndrome, femoral head necrosis and other factors. 1. Muscle strain: If you don’t warm up before doing strenuous exercise, or if you exert yourself too much when doing strenuous exercise, it will lead to excessive muscle contraction or stretching, resulting in muscle strain, which will cause pain in the inner thigh and calf. 2. Piriformis syndrome: most of the piriformis syndrome is related to trauma, due to trauma will lead to piriformis muscle injury, piriformis muscle hypertrophy, compression of the sciatic nerve and a series of symptoms, mainly manifested as the affected side of the buttock pain, the pain will radiate along the sciatic nerve to the calf and foot. 3. Necrosis of the femoral head: Necrosis of the femoral head is a structural change and collapse of the femoral head caused by various reasons, the main manifestation is pain in the hip joint and groin area, the pain will be radiated to the buttocks and lower limbs on the same side, and the pain symptom can be gradually aggravated after activities. There may be other causes of inner thigh and calf tendon pain, and it is recommended that patients go to the hospital for a detailed examination and standardized treatment for the cause.