During vomiting, stomach contents are vomited out through the pharynx and mouth, and in this process, food is mixed with pepsin, stomach acid and pancreatic enzymes, which can cause some damage to the mucous membrane of the throat and cause contact trauma to the mucous membrane of the throat. It is an acidic stimulus and the stimulation of adverse factors, so it causes congestion and edema of the mucosa of the throat. Therefore, after vomiting, you will feel uncomfortable in the throat, mainly due to the action of enzymes and stomach acid, which makes the mucous membrane of the pharynx congested and edematous. So after vomiting, you should drink water to wash down the acid or chemicals to reduce the damage to the mucous membrane of the pharynx.