If patients have weakness and tenderness once they are hungry, there are usually several possibilities as follows: 1. To consider diabetes, for diabetic patients, if there is a hypoglycemic reaction or insufficient food after insulin injection, there will be a decrease in blood glucose after starvation, when blood glucose is lower than 3.9 mmol/L will lead to weakness and tenderness, accompanied by cold sweat and palpitations. 2. If the patient has hypothyroidism, there will be obvious clinical symptoms and performance of weakness, limb tenderness, dizziness and headache after starvation. 4, if the patient has plant nerve dysfunction and cardiac neurosis, there will also be the above symptoms.