Health Topics A-Z

Sarcoidosis is a complex inflammatory disease in which groups of immune cells form small clusters called granulomas in various organs of the body.

Schizophrenia affects how a person thinks, feels, and behaves. People with schizophrenia may seem like they have lost touch with reality, which can be distressing for them and for their family and friends.

Scleroderma is an autoimmune disease. It causes inflammation and thickening in the skin and other areas of the body and organs.

Sexually transmitted infections, or STIs, are infections caused by bacteria, viruses, or parasites that pass from person to person through sexual contact involving the penis, vagina, mouth, or anus.

Shingles is a disease that triggers a painful skin rash. It is caused by the varicella-zoster virus, the same virus that causes chickenpox.

Sickle cell disease is a group of inherited disorders that affect hemoglobin — the major protein that carries oxygen in red blood cells.

Skin cancer is the most common type of cancer.  The main types of skin cancer are squamous cell carcinoma, basal cell carcinoma, and melanoma. Melanoma is much less common than the other types but much more likely to invade nearby tissue and spread to other parts of the body.

Sleep apnea is a common condition in which your breathing stops and restarts many times during sleep. This can prevent your body from getting enough oxygen.

Smell and taste disorders can reduce quality of life, alter eating habits, and signal serious underlying health conditions.

Spina bifida is a birth disorder in which the spine doesn’t fully develop during early pregnancy. Each person with spina bifida has different abilities and health challenges.