As the temperature gradually decreases and the roads are cold and slippery, orthopedic patients feel some torment and pain, and the number of patients with back and leg pain in hospitals is increasing. And there are some people have such habits as winter exercise, morning running, at this time of the year, due to sprains, or sports protection discomfort, prone to femoral injuries, why will winter frequent these? There are two reasons for the frequent occurrence of back and leg pain in winter: one is the intrinsic factor. The intrinsic factor is that we talk about “the kidney is the master of the bone”, the kidney in astrology “kidney is the master of the north”, “north” is “sky”, “sky” is cold. The “sky” belongs to the cold, for water, “the sky is cold and the ground is frozen” on this truth. If, in winter, we do not take enough tonic, or wear too little, it will cause disease; second, the sky is cold and slippery, a careless phone call, a fall, which is easily caused by trauma, so the winter bone injury patients are many. In Chinese medicine, “the kidney is the main bone, in the sky for cold, in the ground for water, is the yin of the yin, and often Yang.” In addition, we can understand the front, the back “yin in the yin, and hide Yang”, “Yang” is the common people say blood gas things, “blood gas” like warm and evil cold. After the cold, as you know, often said that the principle of heat expansion and cold contraction, a cold winter, capillaries have become smaller, thinner, blood to the body parts, such as to the knee, ankle joints, not as much as before (adequate supply), blood is nutritious, this on these parts of the nutrition is not enough, light when feeling sore and sleepy; over time, resulting in joint activities, stiffness, the pain is heavier in the past two days, or can not Move. Many elderly people like to exercise in the morning, which is a misconception. This is a misconception. If it is summer or autumn, when Yang Qi rises, it is very good. In winter, the weather is foggy and cold, so it is not suitable for exercise in the morning. Because the blood supply is not active, plus the air turbidity, cleanliness is very poor, so we breathe a lot of turbidity, will affect the human body, so it is not recommended that these two seasons exercise.