The painful incision during rainy and cloudy days may be caused by local blood circulation. Common surgical incisions or traumatic wounds will form scar after healing, and these scars have fewer capillaries and thicker tissues, which will cause local ischemia and hypoxia. When the weather is sunny, human capillaries are dilated, the inner diameter of blood vessels is larger, and the blood supply is abundant, which can meet the oxygen demand of local tissue cells. When it rains on a cloudy day, due to the increase of air pressure, the human capillaries contract and spasm, and the scar tissue becomes ischemic and hypoxic, resulting in painful incision symptoms. In some patients, the scar tissue proliferation is caused by the recovery process of the incision, especially under the stimulation of weather changes or human sweat, so the incision pain in cloudy and rainy weather is a process that the wound must go through to recover.