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Smallpox

Smallpox (also called variola) is the only disease that has been completely wiped out throughout the world. Smallpox is also potentially one of the most devastating biological weapons ever conceived.   Due to the success of an intense worldwide public health initiative, not one documented naturally occurring case of this highly ...

Snoring

Snoring is the noise produced during sleep by vibrations of the soft tissues at the back of your nose and throat. The noise is created by turbulent flow of air through narrowed air passages.   In general and in most cases, snoring has no medical significance unless it keeps you or others from sleeping.   However, a more ...

Social Anxiety

People with social anxiety disorder (or social phobia) are extremely anxious about what they will say or do in front of other people. This includes public speaking and day-to-day social situations.   But it is more than just being shy or nervous before public speaking. The fear can begin weeks or months before an event. It can cause ...

Staph Infection

Staphylococcus is a group of bacteria that can cause a number of diseases as a result of infection of various tissues of the body. Staphylococcus is more familiarly known as Staph (pronounced "staff").   Staph-related illness can range from mild and requiring no treatment to severe and potentially fatal.   The ...

Stomach Cancer

The stomach is a muscular bag with a capacity of about 1 liter or quart. It lies along the digestive tract between the esophagus and the small intestine.   The stomach serves as a reservoir for food eaten during meals and begins the process of digestion. Its inner walls are composed of glands that secrete acid and digestive enzymes. ...

Sore Throat

Sore throats are usually named for the anatomical site affected.    Pharyngitis: The pharynx, the area of your throat directly behind your mouthand soft palate, is a common hallway for food, liquids, and air. Swallowing safely delivers solids and liquids to the stomach through the esophagus. Pharyngitis is pain and ...

SIDS

Sudden infant death syndrome (also known as SIDS) is defined as the sudden death of an infant younger than 1 year of age. If the child's death remains unexplained after a formal investigation into the circumstances of the death (including performance of a complete autopsy, examination of the death scene, and review of the clinical history), ...

Sunburn

Sunburn is skin damage caused by ultraviolet (UV) rays. Too much exposure to UV light can make your skin red and painful, which can later lead to peeling or blistering.   Reddening caused by overexposure to the sun’s harmful ultraviolet (UV) radiation — may seem like just a temporary irritation, but sunburns can cause ...

Syphilis

Syphilis is a sexually transmitted infection caused by the spirochete bacteria Treponema pallidum subspecies pallidum. The primary route of transmission is through sexual contact however it may also be transmitted from mother to fetus during pregnancy or at birth resulting in congenital syphilis.   Other human diseases caused by ...

SLE

Systemic Lupus Erythematosus (SLE) or Lupus is an autoimmune disease characterized by acute and chronic inflammation of various tissues of the body. Autoimmune diseases are illnesses that occur when the body's tissues are attacked by its own immune system. The immune system is a complex system within the body that is designed to fight ...

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