Hungry and sweaty weakness may be caused by hypoglycemia, anemia, hyperthyroidism and other reasons. 1. Hypoglycemia: when the body is overly hungry, the energy supply will be impaired, and most of the energy comes from glucose in the blood, when the blood glucose concentration drops, it is easy to have a weak sweat and weakness. 2. Anemia: when the blood red blood cells or hemoglobin is lower than normal, it will cause some tissues and organs hypoxia related manifestations, the body may appear hungry, sweaty and weak. 3. hyperthyroidism: when suffering from hyperthyroidism, due to the body’s thyroid hormone level is too high, the body in the high metabolic state, there will also be hungry sweating weakness symptoms. The appearance of hunger sweating weakness, should go to the regular hospital in a timely manner, to identify the cause of the disease, under the guidance of professional doctors to take targeted treatment.