Leg distension and pain occur, and there are basically two clinical situations, including distension and pain in both lower extremities as well as unilateral lower extremity distension and pain. Unilateral lower limb swelling pain is mainly caused by lumbar muscle strain or lumbar disc stenosis in the lower back, which causes nerve compression and reflex pain on one side. Bilateral lower limb swelling pain, such as lower limb swelling pain after standing for a long time, and lower limb swelling pain is reduced when resting or raising the limb, may be related to the state of lower limb venous stasis. After standing for a day, there is a certain problem of blood return to the lower extremities and some blood is retained in the extremities, so a sense of fatigue in the lower extremities can occur. If the lower extremity is distended and painful, it should also be clarified whether there is any other discomfort, such as any change in skin temperature and any muscle atrophy. The best way to further clarify the diagnosis is to go to a hospital and ask for a specialist’s consultation.