In-depth

Addison's disease

Adult Still's disease

Back pain

Bird flu (avian influenza)

Brucellosis

Cancer

Celiac disease

Chronic fatigue syndrome

Cold sore

Cyclospora infection

Dengue fever

Dermatomyositis

Ebola virus and Marburg virus

Ehlers-Danlos syndrome

Ehrlichiosis

Encephalitis

Encephalitis is inflammation of the brain usually caused by a viral infection. Severe cases can cause brain damage, even death.

Endocarditis

Generalized anxiety disorder

Genital herpes

Hangovers

Hantavirus pulmonary syndrome

Hemophilia

Hepatitis A

Hepatitis C

Histoplasmosis

HIV/AIDS

Hypercalcemia

Hypoparathyroidism

Hypothyroidism

Influenza (flu)

Jet lag disorder

Legionnaires' disease

Listeria infection

Most people exposed to listeria don't become ill. But for those at risk of a listeria infection — a foodborne illness — the consequences can be severe.

Mixed connective tissue disease

Muscle cramp

Myofascial pain syndrome

Peripheral artery disease

Plague

Pneumonia

Polio

One of the most feared diseases of the 20th century, polio has been eradicated from the developed world but remains a threat in less developed nations.

Polymyositis

Porphyria

Porphyria is a group of inherited disorders that result from buildup of natural chemicals call porphyrins, which can cause nervous system and skin problems.

Post-polio syndrome

Premenstrual syndrome (PMS)

Pulmonary fibrosis

Salmonella infection

Salmonella infection will cause only diarrhea and stomach pain in some people, but for infants and immunocompromised people, this bacterial illness can cause life-threatening complications.

Severe acute respiratory syndrome (SARS)

Staph infections

Syphilis

Takayasu's arteritis

Toxic shock syndrome

Trichinosis

Vasculitis

Viral hemorrhagic fevers

Yellow fever

Zika virus disease

March 19, 2016