There are two main causes of headache symptoms in the starvation state: 1. hypoglycemic reaction, which is the most common cause. glucose in the blood supplies energy to the whole body, but the brain needs more energy and is more sensitive to hypoxia, so if there is no timely food supplement after applying insulin to lower blood sugar or hypoglycemic reaction occurs in the starvation state, it will cause headache, dizziness, weakness of limbs, panic and other symptoms. 2. migraine, which is A kind of vascular fluctuation headache, which refers to the discomfort symptoms such as headache on one or both temporal areas, and may be accompanied by nausea, vomiting and other discomfort symptoms. It is more common in young female patients. Acute recurrence of migraine can be triggered by mental tension, overexertion and hunger, so it is better to check fasting blood sugar at the hospital to rule out hypoglycemia first.