After drinking the next day upset stomach is a normal reaction after drinking, you can drink milk to protect the gastric mucosa, drink sugar water to promote the body alcohol excretion proper rest. Alcohol can directly stimulate the gastric mucosa after drinking, causing stomach pain, gastric distension, often drink most people will have chronic gastritis, gastric ulcer, is due to the gastric mucosa long-term stimulation caused by alcohol. Alcohol stimulation of the gastric mucosa can also slow gastric emptying, showing nausea and vomiting, after drinking alcohol can drink milk or tea to relieve alcohol, protect the gastric mucosa and reduce alcohol absorption. You can drink sugar water to promote the body’s metabolism, you can also drink warm millet porridge. At the same time, pay attention to rest, if there is acid reflux or vomiting, you can take omeprazole or domperidone under the guidance of the doctor to help digestion and absorption.