Viruses, bacteria, fungi and parasites all can cause infections. Find out more about how to prevent and treat these conditions.
Disease
Anaphylaxis
Anaphylaxis, a severe allergic reaction, is an emergency. Learn who's at risk, what to watch for and what to do when it occurs.
Disease
Brucellosis
Brucellosis is an infectious bacterial disease often spread via direct contact with infected animals or contaminated animal products.
Disease
Oral lichen planus
This ongoing inflammatory condition results in white, lacy patches or red, swollen tissues or open sores inside your mouth that may cause burning or pain.
Disease
Traveler's diarrhea
Learn how to avoid contaminated food and water that may lead to this common travel hazard. Plus, find out what to do if it strikes.
Disease
Gingivitis
Gingivitis is a common and mild form of gum disease that causes irritation, redness and swelling of your gums.
Disease
Barrett's esophagus
Barrett's esophagus, which is linked to chronic heartburn, can turn into cancer of the esophagus. Learn about treatment.
Disease
Zollinger-Ellison syndrome
In this rare disease, tumors in the digestive tract cause excess production of a certain hormone. High levels of this hormone increase stomach acid, leading to peptic ulcers.
Disease
Stomach polyps
These masses of cells that form on your stomach lining usually don't cause symptoms. Learn what causes them and when to be concerned.
Disease
Eosinophilic esophagitis
Learn more about the causes and treatment of eosinophilic esophagitis — a digestive disease caused by an allergic reaction.
Disease
Hiatal hernia
A hiatal hernia occurs when part of the stomach bulges into the chest. It can cause severe heartburn but is treatable.
Disease
Giardia infection (giardiasis)
This type of infection can cause stomach cramps, upset stomach and loose stools. Find out how to treat and prevent this waterborne parasite.