In-depth

Addison's disease

Addison's disease occurs when your adrenal glands produce insufficient amounts of certain important hormones. Treatment may include taking corticosteroids.

Adult Still's disease

Daily fevers, achy joints and an intermittent, salmon-pink rash may be an indication that you have a rare inflammatory disorder called adult Still's disease.

Aspergillosis

Autoimmune hepatitis

Autoimmune hepatitis — Early detection, medications can help.

Behcet's disease

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.

Bone spurs

Brucellosis

Brucellosis is an infectious disease that spreads from animals to people, mainly via unpasteurized dairy products. Travelers should take special care to avoid infection.

Bursitis

Cancer

Celiac disease

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.

Chronic fatigue syndrome

Churg-Strauss syndrome

Churg-Strauss syndrome is a rare disorder marked by blood vessel inflammation that affects organs throughout the body. Asthma is the most common sign.

Complex regional pain syndrome

Complex regional pain syndrome is a chronic, painful disease that typically affects an arm or leg that was recently injured or infected.

Dengue fever

Diabetic neuropathy

Dislocation

A blow to your joint can dislocate the bones that meet at that joint. Don't try popping them back into place yourself. Get medical help.

Ebola virus and Marburg virus

Ehrlichiosis

Encephalitis

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

Gonorrhea

Gonorrhea is a highly contagious sexually transmitted infection. Without treatment, serious complications can occur.

Hemochromatosis

Hemochromatosis causes your body to store large amounts of iron, which can cause life-threatening complications. The simple treatment is to regularly remove blood.

Hemophilia

Hepatitis B

Hepatitis C

Histoplasmosis

HIV/AIDS

Hypercalcemia

Hypothyroidism

Although low levels of thyroid hormones (hypothyroidism) can leave you feeling tired and depressed, medications can help you live a normal life.

Jellyfish stings

Kawasaki disease

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.

Lupus

Lyme disease

Lyme disease is a tick-borne illness. Left untreated, it can lead to serious and lingering complications — including arthritis.

Manage the pain of rheumatoid arthritis

Mixed connective tissue disease

Myocarditis

Myocarditis is a disease in which the heart muscle becomes inflamed and swollen, often as the result of an infection.

Parvovirus infection

Pituitary tumors

Pituitary tumors are abnormal growths in the pituitary gland in the brain. Most are noncancerous (benign). Some may cause overproduction of hormones and associated problems.

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

Post-polio syndrome

Premenstrual syndrome (PMS)

Protect your joints as you clean when you have rheumatoid arthritis

Pseudogout

Pulmonary fibrosis

Pulmonary fibrosis results from scar tissue that forms in your lungs. This affects your ability to breathe and obtain enough oxygen.

Reactive arthritis

Reactive arthritis is an inflammatory condition that develops in response to an infection in another part of your body.

Rheumatic fever

Rheumatic fever, an inflammatory disease triggered by untreated or poorly treated strep throat, can cause permanent heart damage.

Rubella

Sacroiliitis

Sacroiliitis is one cause of low back pain and discomfort. It's an inflammation of the sacroiliac joints, which connect the lower spine and pelvis.

Septic arthritis

Septic arthritis occurs when a joint becomes infected. Find out more about this serious condition.

Sjogren's syndrome

Staph infections

Takayasu's arteritis

Takayasu's arteritis is an uncommon form of vasculitis that affects the large arteries.

Valley fever

Vasculitis

Wegener's granulomatosis

Wegener's granulomatosis is an uncommon disease that causes blood vessel inflammation that can damage lungs, kidneys and other organs. Untreated, it can be fatal.

Wilson's disease

March 21, 2013