Health Topics A-Z

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.

Sensors are tools designed to detect and respond to specific inputs from the physical environment. This information can be helpful in biomedical research and medical care.

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.

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.

Substance use disorders are chronic, treatable medical conditions that involve compulsive seeking and use of alcohol or other drugs, despite harmful consequences. Substance use disorders range in severity from mild to severe.

Sudden infant death syndrome (SIDS) is the sudden, unexplained death of an infant younger than 1 year old that remains unexplained after a complete investigation.

Suicide is complicated and tragic, there are ways to help prevent it from happening. You can learn about the warning signs for suicide and how to find help.