Addison's disease occurs when your adrenal glands produce insufficient amounts of certain important hormones. Treatment may include taking corticosteroids.
Do you feel trapped in your own home? Do you worry about having a panic attack? Find out how agoraphobia can be treated.
Anaphylaxis is the most serious type of allergic reaction. It often occurs rapidly after exposure to an allergen and may be life-threatening.
Antibiotics save lives, but they can also have side effects. The most common are mild to severe diarrhea and a serious type of colitis.
Ascariasis is a common type of roundworm infection found worldwide. It's spread by poor hygiene and improper sanitation. Infections are effectively treated with medication.
Bee stings — Comprehensive overview covers prevention, treatment of bee stings.
Behcet's disease affects several body systems and causes a variety of signs and symptoms. Find out what it is and how it's treated.
A type of influenza normally found in birds, bird flu first appeared in humans in 1997. Experts worry it could lead to a flu pandemic.
A microscopic parasite causes Blastocystis hominis infection. Experts disagree as to whether this infection causes diarrhea and other associated signs and symptoms.
Blind loop syndrome occurs when a portion of bowel is bypassed. The condition is most often a complication of abdominal surgery.
C. difficile can be a life-threatening infection. It typically develops when antibiotics destroy other bacteria in your intestines, allowing C. difficile to flourish.
Carcinoid tumors sometimes secrete chemicals that cause the signs and symptoms of carcinoid syndrome. Carcinoid tumors are rare. Carcinoid syndrome is even rarer.
Carcinoid tumors are rare, slow-growing cancerous tumors that most often occur in the gastrointestinal tract or in the lungs.
Celiac disease is an immune reaction to gluten, a protein found in certain foods. As a result, the body is unable to absorb some important nutrients.
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 is a rare disorder marked by blood vessel inflammation that affects organs throughout the body. Asthma is the most common sign.
Colon cancer and rectal cancer combined are the second-leading cause of cancer-related deaths in the United States. Regular screening tests can help reduce your risk.
Cryptosporidium infection may cause diarrhea in healthy people, but for people with HIV/AIDS and weakened immune systems, the illness can cause serious complications.
Cyclic vomiting syndrome can last for hours or days and shares many triggers with migraines.
Cyclospora infection is an uncommon foodborne intestinal infection that causes diarrhea. Outbreaks have been linked to contaminated water and produce.
Diabetes insipidus is a rare condition characterized by intense thirst and the excretion of large amounts of urine.
Diabetes can damage nerves throughout your body — a condition known as diabetic neuropathy. Nerve damage can cause pain, disability and other serious complications.
Drug allergy can occur with many medications. Find out what you can do to recognize and avoid potentially dangerous reactions.
Ear infections are common in children. These bacterial or viral infections of the middle ear can cause mild to severe ear pain.
Ehrlichiosis is a tick-borne disease that causes flu-like symptoms. When you're outdoors, be aware of steps to prevent tick bites.
Endometriosis is a common and often painful disorder in which tissue that normally lines the inside of your uterus grows outside your uterus.
If you have difficulty controlling your bowel movements, don't shy away from talking to your doctor — effective treatments for fecal incontinence are available.
Food poisoning has many forms, and some can be serious. Here's how to recognize food poisoning and ways to prevent getting sick.
Giardia infection is a common waterborne illness. Learn the symptoms and reduce your risk.
Hantavirus pulmonary syndrome is initiated by a rodent-carried virus that infects the lung tissues, bringing on flu-like symptoms, respiratory problems and even death.
Hirschsprung's disease, a disease of the colon, is present at birth and can cause serious problems passing stool.
More than 39 million people are living with HIV — the virus that causes AIDS. Millions more are likely to become infected in the next decade.
Hunter syndrome, a rare metabolic disorder, occurs when the body can't break down certain complex sugars. Complications occur as these sugars accumulate in the body.
Inflammatory bowel disease can be painful and debilitating, and it can cause life-threatening complications. Find out more about treating this digestive system disorder.
Intestinal ischemia occurs when the blood supply to your digestive system is reduced. Abdominal pain is a common symptom. Several treatment options are available.
Intestinal obstruction — a serious condition that requires prompt medical attention — occurs when a blockage of the intestine prevents food or fluid from passing through.
A rare but serious disorder, intussusception occurs when one part of the intestine slides into an adjacent part, often causing intestinal obstruction.
Ischemic colitis is a disorder in which the colon becomes inflamed, usually due to a disruption of blood flow.
Flying across multiple time zones disrupts your natural body rhythms, leading to sleep problems and other symptoms. Learn how to put jet lag to rest.
Kawasaki disease — the leading cause of acquired coronary disease in children — causes artery wall inflammation throughout the body. It affects children younger than age 5.
Lactose intolerance means you can't fully digest milk sugar (lactose). Though it's generally not dangerous, the symptoms can be uncomfortable.
Legionnaires' disease, a severe form of pneumonia, is caused by bacteria that can live in water in air conditioning systems, showers and spas.
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 is one of the oldest diseases on Earth and is still one of the leading killers.
Mesenteric lymphadenitis is an inflammation of the lymph nodes in the tissue that attaches various organs to your abdominal wall (mesentery). It mainly affects children.
Myocarditis is a disease in which the heart muscle becomes inflamed and swollen, often as the result of an infection.
Breaking your addiction to nicotine is difficult and takes commitment, support and time. But doing so can make a huge difference in your overall health.
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 (OHSS) — Comprehensive overview covers symptoms, treatment of this complication of infertility treatment.
Peanut allergy can be serious. Find out what you need to know to prevent a life-threatening reaction.
Peritonitis is an infection of the membrane that lines your inner abdominal wall and covers the organs within your abdomen (peritoneum).
Plague is a disease carried by rats and other rodents. The risk of developing plague is low, and most cases occur in Africa.
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) can make you miserable in the days before your monthly period. Here's how to handle it — bloating, depression and all.
Preterm labor — Comprehensive overview covers the symptoms, treatment and prevention of preterm labor.
Primary biliary cirrhosis begins with inflammation in the liver's small bile ducts, but eventually can lead to damage and scarring in the liver itself.
Proctitis is an inflammation of the lining of the rectum.
Pseudomembranous colitis is an inflammation of the colon that occurs most often in people using antibiotics.
Radiation sickness is the effect of high doses of radiation on the body. The severity of illness depends on how much radiation the body absorbs.
Roseola is a common infection of childhood. The condition causes a fever that lasts several days, followed by a rash on the trunk and neck.
Rotavirus causes severe diarrhea in infants and children. Most cases can be treated at home with extra fluids.
Serotonin syndrome — caused by mixing some antidepressants and other medications — can be life-threatening if left untreated.
Severe acute respiratory syndrome (SARS) has sickened people worldwide. Although effective treatments aren't yet available, common-sense precautions may help you avoid infection.
Shigella infection (shigellosis) is a disease that causes diarrhea. Young children are most likely to get the disease, but it can spread to anyone.
Intense fear and avoidance of social situations can be debilitating. Take action to avoid long-term consequences caused by worry and isolation.
Swine flu — Comprehensive overview covers swine flu symptoms, tests, treatment and prevention.
Tapeworms most commonly enter your body through contaminated food or water. Symptoms aren't always present, but the prognosis is good with prompt diagnosis and treatment.
Trichinosis is a roundworm infection you get from eating undercooked, infected pork or other meats. Medications can eliminate the parasite and treat symptoms.
Tularemia is a rare, highly infectious disease spread by insects and wild animals. Landscapers, hunters and laboratory workers are especially at risk.
Although rare in industrialized nations, typhoid fever is a serious threat in many parts of the world. Learn how to stay safe when you travel.
Ulcerative colitis is a form of inflammatory bowel disease (IBD) — a serious inflammation of the digestive tract that can cause abdominal pain and diarrhea.
Lacking certain vitamins can lead to vitamin deficiency anemia. Find out which vitamins are linked to this condition.
Whipple's disease is a rare bacterial infection that affects primarily the gastrointestinal system, and can be treated successfully with antibiotics.
In Zollinger-Ellison syndrome, tumors in the pancreas or duodenum secrete a hormone called gastrin that leads to excessive stomach acid and ulcers.
Jun. 11, 2013
- Feldman M, et al. Sleisenger & Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2010. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-1-4160-6189-2..X0001-7--TOP&isbn=978-1-4160-6189-2&about=true&uniqId=229935664-2192. Accessed April 5, 2013.
- Diarrhea. National Institute for Diabetes and Digestive and Kidney Diseases. http://digestive.niddk.nih.gov/ddiseases/pubs/diarrhea/index.htm. Accessed April 5, 2013.
- Ferri FF. Practical Guide to the Care of the Medical Patient. 8th ed. Philadelphia, Pa. Mosby Elsevier; 2010. http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-0-323-07158-1..00003-1--s8700&isbn=978-0-323-07158-1&sid=1411661283&uniqId=403732597-3#4-u1.0-B978-0-323-07158-1..00003-1--s8715. Accessed April 5, 2013.