The causes of sudden yawning include physiological factors and pathological factors such as cerebral hemorrhage and cerebral infarction. 1. Physiological factors: If the patient does not have enough sleep at night or is exhausted, the phenomenon of sudden yawning can occur due to the lack of oxygen in the brain, which is a physiological phenomenon, and the patient’s symptoms can be improved after resting. 2. Cerebral hemorrhage: If the patient has cerebral hemorrhage, the cerebral hemorrhage will lead to insufficient blood supply to the brain, resulting in cerebral ischemia and hypoxia, which will lead to the phenomenon of yawning. 3. Cerebral infarction: If the patient has cerebral infarction, the blood vessels in the brain will be blocked, resulting in insufficient blood and oxygen supply to the brain, so the symptom of yawning will appear. Yawning all of a sudden can be a precursor to seizures and migraines. Please consult a doctor in time, under the guidance of a professional physician to clarify the cause of the disease and then carry out targeted treatment.