General weakness when hungry may be caused by hypoglycemia, hyperthyroidism and diabetes. 1. Hypoglycemia: Hypoglycemia can occur when you are hungry, the glucose level in the blood is low, and the body’s energy supply is insufficient, which will lead to weakness, dizziness, cold sweat and other symptoms. 2. Hyperthyroidism: when the thyroid gland is hyperfunctional, the body has a vigorous metabolism and consumes more energy. When the stomach is hungry, the body doesn’t get energy supplementation in time and is accompanied by high consumption, which will also lead to weakness, dizziness and other symptoms. 3. Diabetes: when diabetes occurs, the body can not effectively utilize glucose, starvation cells do not get enough energy supply, can also make the patient appear general weakness, dizziness and other symptoms. Hunger weakness may also be related to other causes, it is recommended to go to the hospital in a timely manner, under the guidance of a professional physician to clarify the cause of the disease, and to give targeted treatment or therapy.