First, the heart is weak and blood cannot be supplied to the peripheral parts of the body. Another situation is that there is insufficient blood in the body, and hemoglobin and red blood cells are low.

Second, there is obstruction in blood vessels. Fever and cold will affect the central nervous system of the brain, leading to cold hands and feet.

Third, there is something wrong with the sympathetic nerve function, which makes the muscles unable to contract when they are cold, and generates heat energy to resist the cold. This is a neurological condition, and it is also difficult to treat, so we must find out the reason and treat it accordingly.