This joint inflammation can cause pain in the buttocks or lower back. The pain can go down one or both legs.
Disease
Salivary gland tumors
Learn about this rare tumor that forms in the salivary glands. Treatments include surgery and radiation therapy.
Disease
Salmonella infection
This common bacterial infection is spread through contaminated food or water and affects the intestinal tract. Learn more about prevention and treatment.
Disease
Sarcoidosis
This treatable inflammatory condition causes growth of tiny granulomas in different parts of the body, including the lungs, eyes, skin and heart.
Disease
Sarcoma
Learn about this cancer that forms in the bones and the connective tissue. Find out about symptoms, diagnosis, treatment and the many types of this condition.
Disease
Scabies
Learn more about this contagious condition that causes intense itching, usually in areas where the skin folds, such as around joints.
Disease
Scarlet fever
Learn more about the symptoms, causes, complications and treatment of this strep bacterial infection that causes a red rash, sore throat and high fever.
Disease
Schizoaffective disorder
This mental health condition includes schizophrenia symptoms, such as delusions and hallucinations, and mood disorder symptoms, such as depression and mania.
Disease
Schizoid personality disorder
People with this mental health condition do not want to be with others. They stay away from social activities. They're limited in how they express emotions.
Disease
Schizophrenia
This mental condition can lead to hallucinations, delusions, and very disordered thinking and behavior. It can make daily living hard, but it's treatable.
Disease
Schizotypal personality disorder
This condition includes odd or eccentric thinking and behavior, few close relationships, and great distrust of others. Treatment can make symptoms better.
Disease
Schwannoma
Learn about the diagnosis and treatment of this usually benign, slow-growing tumor that begins in peripheral nerve cells.