There are many reasons why standing is tiring and walking is not, including physiological factors and pathological factors (such as varicose veins of the lower limbs). 1. Physiological factors: According to the anatomical position of human body, the above symptoms may be a physiological reaction. When a person stands, due to the effect of gravity, there is a large amount of blood flow retained in the lower limbs, and since there is no muscle contraction, venous blood return is more difficult, and the retained blood is very tired due to the lack of oxygen and the body’s muscle tone decreases. On the contrary, muscle contraction while walking can promote blood circulation. 2. Varicose veins of the lower limbs: Due to the destruction of venous valves, it is difficult for blood to return, and if the patient stands for a long time, it will cause the blood retention to worsen, resulting in drowsiness and soreness of the lower limbs. If walking activities, due to muscle contraction and extrusion, it may help to relieve the above symptoms. In addition to the above, chronic strain diseases of the lower limbs, such as stiff leg muscles, may also show the above symptoms. If the above symptoms do not improve, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment.