When hypoglycemia occurs during colonoscopy, its clinical symptoms are mostly manifested as panic, pallor and dizziness. 1. Panic: During the onset of hypoglycemia, patients with hypoglycemia may stimulate the increase of adrenaline secretion, leading to sympathetic nerve excitation, which leads to the phenomenon of panic. 2. Pallor: During the onset of hypoglycemia, patients with hypoglycemia may lead to autonomic nerve dysfunction, which may cause patients to appear pale. 3. Dizziness: Since the metabolism of brain cells mainly relies on glucose to provide energy, when the organism experiences hypoglycemia, it may lead to insufficient supply of glucose in the blood, resulting in the phenomenon of dizziness. When patients have hypoglycemic reaction during taking colonoscopy, it is recommended to give treatment in time to avoid delaying the condition.