Nausea and vomiting are not diseases, Vomiting, or throwing up, is a forceful discharge of stomach contents. It can be a one-time event linked to something that doesn’t settle right in the stomach. Recurrent vomiting may be cause by underlying medical conditions. Frequent vomiting may also lead to dehydration, which can be deadly if left untreated.

Nausea and vomiting in adults isn't usually a sign of anything serious and tends to only last 1 or 2 days.

Vomiting is the body’s way of ridding itself of harmful substances from the stomach, or it may be a reaction to something that has irritated the gut.

One of the most common causes of vomiting in adults is gastroenteritis. This is an infection of the gut usually caused by bacteria or a virus, which will normally improve within a few days.