Low blood sugar may occur when you are hungry without eating, especially if you exercise a lot, are hungry for a long time, or have diabetes or other serious underlying conditions. Hypoglycemia generally does not occur in normal healthy people who do not eat for a short period of time. The endocrine regulation function of normal healthy people is normal, in the time of hunger, the body sugar-raising hormone secretion increases, such as adrenal hormones, glucocorticoids and so on. Therefore, for a short period of time without food and hunger, there will not be obvious hypoglycemia. However, in times of extreme hunger and fatigue, there is a lack of energy and hypoglycemia can occur, manifesting itself in symptoms such as trembling hands, panic, cold sweat, and fainting. In the case of diabetes or other serious underlying diseases, blood glucose regulation is incomplete, and hypoglycemia is likely to occur when you are hungry. Hypoglycemia should seek medical attention in time to avoid progression of the disease.