The following are possible causes of vomiting:

• Viral infections
• Medications
• Seasickness or motion sickness
• Migraine headaches
• Morning sickness during pregnancy
• Food poisoning
• Food allergies
• Brain tumors
• Chemotherapy in cancer patients
• Bulimia
• Alcoholism

These are possible causes of vomiting in infants (0 to 6 months):

• Congenital pyloric stenosis, a constriction in the outlet from the stomach. With this disorder, the infant vomits forcefully after each feeding but otherwise appears to be healthy.
• Food allergies or milk intolerance
• Gastroenteritis (infection of the digestive tract that usually causes vomiting with diarrhea)
• Gastroesophageal reflux
• An inborn error of metabolism
• Hole in the bottle nipple may be wrong size, leading to overfeeding
• Infection, often accompanied by fever or runny nose
• Intestinal obstruction, evidenced by recurring attacks of vomiting and crying or screaming as if in great pain
• Accidentally ingesting a drug or poison

Call the doctor immediately or take the child to an emergency care facility if you suspect poisoning or drug ingestion!