The most common symptoms of hypoglycemia include autonomic arousal symptoms, central nervous system symptoms, etc. Hypoglycemia may cause harm to brain cells and so on. 1. Autonomic excitation symptoms: When hypoglycemia occurs, it may lead to increased secretion of adrenocorticotropic hormone, causing symptoms such as panic, accelerated heart rate, sweating, fatigue, hunger, and pallor. 2. Central nervous system symptoms: hypoglycemia may cause central nervous system disorders, resulting in inattention, dizziness, unsteady gait, restlessness, etc. When falling due to hypoglycemia, it can be directly life-threatening; if the blood glucose continues to be at a low level, it may lead to coma or even death. 3. Brain cell harm: low blood sugar can lead to irreversible brain cell damage, the brain is particularly sensitive to low blood sugar, if low blood sugar caused by coma lasts for more than 6 hours, it can cause damage to brain cells and even death. If hypoglycemia occurs, it is recommended to take foods with high sugar content, such as candies and sugary drinks, etc., and go to the hospital in time to avoid delaying the condition and causing other damages under the guidance of the doctor.