This time of year is prime season for these fast-spreading illnesses.

Viral gastroenteritis — commonly known as the stomach flu — is an infection of the intestines that involves inflammation of the lining of the stomach, and can cause such unpleasant symptoms as nausea, ...

Once a virus infects your body, it can destroy healthy cells and make multiple copies of itself. The virus causing COVID mainly attacks the cells lining your airways. This makes it hard for you to ...

More than 150 people aboard a recent Princess Cruises voyage became ill, and norovirus is believed to be the cause. (AP Photo ...

As doctors learn more about COVID-19, more and more symptoms are being reported. Some people who are ill with the coronavirus may experience a "fizzing" sensation, others could be coughing up blood.

Norovirus doesn’t usually cause a rash, though some people develop hives. A rash that accompanies stomach symptoms may suggest a different stomach virus or inflammatory bowel disease. Norovirus is a ...