Sudden regurgitation is associated with improper diet, acute gastritis, pregnancy, and intracranial hypertension. In some people, sudden regurgitation is caused by eating irritating foods in the diet, such as eating foods such as chili peppers, leeks, and onions, which contain spicy substances that enter the stomach and cause irritation to the gastric mucosa, leading to spasm and contraction of the stomach, and sudden regurgitation can occur. In acute gastritis, there is inflammation in the stomach wall and impaired gastric function, which increases the internal pressure in the stomach, and food will be regurgitated due to the pressure. During pregnancy, women experience an increase in progesterone, which can cause irritation to the digestive system and induce sudden regurgitation. When the body has intracranial hypertension, such as meningioma, meningitis, and hypertension, it can cause stimulation of the cranial nerves, resulting in excitation of the vomiting central nerve, which can lead to sudden regurgitation.