Chest sweating in the second half of the night may be a heart problem, or it may be caused by other diseases, such as hypoglycemia, hyperthyroidism and so on. 1. Heart problems: women sweating in the chest in the middle of the night is considered to be caused by myocardial ischemia. The root cause of myocardial ischemia is that the coronary artery’s blood and oxygen supply to the myocardium cannot meet the myocardium’s demand for oxygen. Some patients manifest discomfort and pain in the precordial region, and may also experience weakness and sweating. 2. Hypoglycemia: the glucose level in plasma is lower than normal, and the common symptoms are palpitation, tremor, sweating, etc.; in severe cases, there may be mental changes. 3. Hyperthyroidism: Symptoms caused by excessive production of thyroid hormones, resulting in accelerated metabolic activity of the body; symptoms of hyperthyroidism are characterized by irritability, fear of heat, excessive sweating and so on. If the symptoms are not relieved, or the symptoms are more serious, you should go to the hospital in time to avoid delaying your condition.