Find out what you can do to treat this flaky skin condition that can cause scaly skin and stubborn, itchy dandruff.
Disease
Seborrheic keratosis
Learn more about the symptoms and treatments of this common, noncancerous skin growth that gradually appears as you age.
Disease
Secondary hypertension
Learn more about high blood pressure that's caused by another medical condition. Find out about risk factors and treatments to help you stay healthy.
Disease
Seizures
Learn about this burst of electrical activity in the brain and what causes it. Find out what to do if you see someone having a seizure.
Disease
Selective IgA deficiency
A lack of the disease-fighting antibody called immunoglobulin A (IgA) may cause frequent infections or serious complications.
Disease
Self-injury/cutting
Deliberately hurting your own body, such as by cutting or burning, is a harmful way to cope with emotional pain, intense anger and frustration.
Disease
Separation anxiety disorder
This is intense or prolonged separation anxiety that interferes with school or other daily activities or includes panic attacks. Learn about treatment.
Disease
Sepsis
Learn more about the symptoms and treatment of sepsis, a serious infection-related illness.
Disease
Septic arthritis
Learn about this painful infection in a joint and why quick treatment can help lessen joint damage.
Disease
Serotonin syndrome
Learn how certain drug interactions or an increase in the dose of certain drugs can cause serotonin levels to rise to potentially dangerous levels.
Disease
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
Disease
Sex headaches
Learn about the causes and treatment of this type of headache.