Pregnant women sweat more in the second trimester, which is generally a normal physiological phenomenon. The basal metabolic rate increases during pregnancy and can reach 15-20% in late pregnancy, which results in changes in the function of the vegetative nervous system, causing unstable vasodilation and contraction and increased blood flow to the skin, resulting in increased sweating. In addition, during pregnancy, the concentration of cortisol and hemoglobin in the blood increases due to the increase of estrogen, which leads to the hyperactive state of adrenal cortical function, which results in vasoconstriction and increased blood flow to the skin, leading to increased sweating. This situation does not require too much tension and worry, appropriate amount of warm water, eat more fresh fruits and vegetables, usually pay attention to wear loose underwear to avoid stimulating the skin.