Acute gastritis usually has a sudden onset and relatively severe symptoms. It can include upper abdominal pain, acid reflux, heartburn, nausea, vomiting, and even an inability to eat. This condition is most often caused by poor diet, such as excessive drinking, spicy and irritating foods, etc., and can also be induced by medication, such as non-steroidal drugs or hormonal drugs. The duration of hospital treatment depends on the specific situation. If the patient's general condition is acceptable and they can eat, recovery typically takes about three to five days. Therefore, the duration is not usually very long. However, in some cases, such as drug-induced acute gastric mucosal lesions, which are relatively severe and can involve bleeding, treatment with medications usually requires at least a week or more.