Some molecules of alcohol are absorbed into the blood by capillaries in the stomach wall. The rest is carried in gradual stages to the intestines along with the rest of the stomach contents.
Alcohol molecules are very small and can easily penetrate the cells of the stomach wall and enter the capillaries. About 20 percent of the alcohol molecules are absorbed into the blood in the stomach. The rest of the alcohol gradually flows through the gateways known as the pylorus and the duodenum to reach the small intestine.
When you have eaten the alcohol will be absorbed less fast in your stomach. Therefore it’s always wise to eat before you drink alcohol.