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Disease

Vasculitis

This swelling and irritation of the blood vessels may thicken and weaken blood vessel walls. It can restrict blood flow and damage organs.
Disease

Spinal headaches

These headaches can happen after a spinal tap procedure or spinal anesthesia, and usually don’t require treatment.
Disease

Thunderclap headaches

These headaches are sudden and severe, and can warn of a life-threatening condition — so seek immediate medical attention.
Disease

Infectious diseases

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.

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