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.
Disease
Schwannomatosis
This rare condition causes slow-growing tumors on nerves, including on the nerve in the ear that carries sound information to the brain.
Disease
Sciatica
Pressure on the sciatic nerve can cause pain and often numbness down a leg. Self-care measures might help.
Disease
Scleroderma
This group of rare diseases involves the hardening and tightening of the skin and connective tissues. Some forms can affect internal organs.
Disease
Sclerosing mesenteritis
Sclerosing mesenteritis is a rare condition that may lead to blockage in the small intestine. Learn about treatment at Mayo Clinic.
Disease
Scoliosis
This side-to-side curve of the spine happens most often during the growth spurt after age 10. Treatment may include bracing or surgery.
Disease
Scorpion sting
Scorpion stings are painful but rarely life-threatening. Young children and older adults are most at risk of serious complications.
Disease
Scrotal masses
Lumps in the scrotum have various causes. Even painless lumps should be checked promptly by a health care professional.
Disease
Seasonal affective disorder (SAD)
This type of depression is related to changes in seasons and begins and ends at about the same times every year.
Disease
Sebaceous carcinoma
Learn about diagnosis and treatments for this rare cancer that often affects the eyelid. Treatments include Mohs surgery and radiation.