What is nausea?
A person with nausea has the sensation that he or she might vomit. Nausea always occurs before vomiting. Nausea is caused by many illnesses. In general, vomiting is more serious than nausea alone.

What are the symptoms of nausea?
Symptoms that occur with nausea include vomiting, abdominal pain, diarrhea, fever, lightheadedness, rapid pulse, excessive sweating, dry mouth, and decreased urination. Serious symptoms that can occur with nausea include chest pain, fainting, vomiting blood, confusion, and lethargy.

How does the doctor treat nausea?
Treatment for nausea depends on the underlying cause. Treatment may include a clear liquid diet, a full liquid diet, and medications to control nausea.