Leg pain after a change in weather may be caused by poor blood circulation after catching a cold, or it may be the early stage of rheumatism. Most of these pains occur in people who have bad joints or in older people who do not exercise regularly. Most of these pains can be relieved by resting and keeping warm, but when the pain occurs, the legs feel cold, tight and the tendons move unfavorably. If there is swelling at the same time, consider having joint effusion. If it occurs repeatedly, rheumatoid arthritis can be easily formed, so it is necessary to go to the hospital to confirm the diagnosis of the four rheumatism items. You can also do acupuncture or bake electricity to improve circulation. Usually add more clothes when the seasons change. Warm water foot bath at night can also improve circulation, the water can be added to invigorate blood Chinese herbs, such as safflower, tendon grass, peach kernel, etc..