Nausea is the very unpleasant feeling of being about to vomit. Vomiting is the expulsion of the contents of the stomach. It's associated with a feeling of nausea and strong contractions of the abdominal muscles. Vomiting is different from regurgitation, in which one spits up stomach contents into the esophagus without feeling sick and without strong muscle contractions.
Tired of being constipated and think you might need a laxative? Millions of Americans suffer with symptoms of constipation:
Straining while having a bowel movement
A feeling of obstruction or incomplete evacuation
Fewer than three bowel movements per week
Laxatives contain chemicals that help increase stool motility, bulk, and frequency -- thus relieving temporary constipation. But when misused or overused, they can cause problems, including chronic constipation....
Vomiting -- especially if it comes with diarrhea -- can cause dangerous dehydration. This is more likely to happen to children. When caring for a sick child, be alert to symptoms that mean the child needs water: dry lips and mouth, sunken eyes, rapid pulse, rapid breathing, and, in babies, a sunken look to the soft spot on the top of the head and no wet diapers.
Sometimes the cause of nausea and vomiting is psychological. This doesn't mean the symptoms aren't real. A qualified clinical psychologist or psychiatrist can help. People who often make themselves vomit may have an eating disorder. This can be a life-threatening condition. If you eat a lot and then make yourself vomit, you need professional help.