The symptoms of soreness below the knee can be caused by the following reasons: first, in addition to local soreness, there are also symptoms of hip pain, most likely due to pear-shaped muscle syndrome. The pear-shaped muscle is a muscle on the outside of the pelvis, controlling the movement of the leg, below the pear-shaped muscle is the location of the sciatic nerve, once the pear-shaped muscle is stimulated by exertion, cold, trauma, it will induce congestion and edema of the pear-shaped muscle. Because of its position in relation to the sciatic nerve, it can lead to inflammatory stimulation of the sciatic nerve and compression of muscle edema, causing soreness in the area controlled by the sciatic nerve. The anterior side of the calf below the knee is exactly the sciatic nerve distribution area, so many patients with pear-shaped muscle syndrome will have soreness symptoms below the knee. Second, it may be caused by myofasciitis of the calf. This location is the location of the muscles and fascia of the front side of the calf, once overworked, it will induce myofasciitis, triggering local pain symptoms.