In-depth

Addison's disease

Agoraphobia

Do you feel trapped in your own home? Do you worry about having a panic attack? Find out how agoraphobia can be treated.

Amyloidosis

Anaphylaxis

Anaphylaxis is the most serious type of allergic reaction. It often occurs rapidly after exposure to an allergen and may be life-threatening.

Anthrax

Antibiotic-associated diarrhea

Appendicitis

Ascariasis

Bee sting

Behcet's disease

Bird flu (avian influenza)

Blastocystis hominis infection

Blind loop syndrome

C. difficile infection

Carcinoid syndrome

Carcinoid tumors

Celiac disease

Chagas disease

Cholera

Cholera causes severe diarrhea and can kill in a matter of hours, yet can be easily treated with oral or intravenous fluids.

Churg-strauss syndrome

Colon cancer

Colon polyps

Crohn's disease

Cryptosporidium infection

Cyclic vomiting syndrome

Cyclic vomiting syndrome can last for hours or days and shares many triggers with migraines.

Cyclospora infection

Cytomegalovirus (CMV) infection

Diabetes insipidus

Diabetic neuropathy

Diverticulitis

Drug allergy

E. coli

Ear infection (middle ear)

Ebola virus and Marburg virus

Ehrlichiosis

Endometriosis

Fecal incontinence

Food poisoning

Food poisoning has many forms, and some can be serious. Here's how to recognize food poisoning and ways to prevent getting sick.

Giardiasis

Graves' disease

Hantavirus pulmonary syndrome

Hirschsprung's disease

HIV/AIDS

Hunter syndrome

Inflammatory bowel disease (IBD)

Intestinal ischemia

Intestinal obstruction

Intussusception

Irritable bowel syndrome

Ischemic colitis

Jet lag disorder

Kawasaki disease

Lactose intolerance

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.

Malaria

Mesenteric lymphadenitis

Milk allergy

Myocarditis

Nicotine dependence

Norovirus infection

Noroviruses cause an intestinal flu-like illness that typically resolves within days. Norovirus infection is highly contagious, especially in closed settings like hospitals and cruise ships.

Ovarian hyperstimulation syndrome

Peanut allergy

Pelvic inflammatory disease (PID)

Peritonitis

Plague

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.

Premenstrual syndrome (PMS)

Preterm labor

Primary biliary cirrhosis

Primary sclerosing cholangitis

Proctitis

Pseudomembranous colitis

Q fever

Radiation sickness

Reye's syndrome

Roseola

Rotavirus

Serotonin syndrome

Serotonin syndrome — caused by mixing some antidepressants and other medications — can be life-threatening if left untreated.

Severe acute respiratory syndrome (SARS)

Shellfish allergy

Shigella infection

Smallpox

Social anxiety disorder

Swine flu (H1N1 flu)

Tapeworm infection

Toxic shock syndrome

Trichinosis

Tularemia

Typhoid fever

Ulcerative colitis

Vesicoureteral reflux

Vitamin deficiency anemia

Wheat allergy

Whipple's disease

Zollinger-Ellison syndrome

Sept. 02, 2016