You think you have food poisoning and cannot keep food or water down. Nausea and vomiting caused by food poisoning usually appear one to 24 hours after a meal and usually resolves quickly on their own. Some kinds of food poisoning, such as salmonella, may take longer.
You have symptoms of nausea that last more than a week. If you are a woman and have been having sex without using birth control, you may be pregnant.
You are an adult and have been vomiting for more than 24 hours.
Your child under the age of 6 has been vomiting more than a few hours, has diarrhea or signs of dehydration, hasn't urinated for six hours, or has a fever of more than 100 degrees F.
Your child aged 6 and older has been vomiting for more than 24 hours, has signs of dehydration, hasn't urinated for six hours, or has a fever of more than 102 degrees F.
See a Doctor or Call an Ambulance If:
There is blood in the vomit or if the vomit looks like coffee grounds.
The person vomiting becomes confused or sleepy or loses alertness.