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A stomach infection, sometimes called gastroenteritis, can be caused by a viral, bacterial, or parasitic infection. It is

A subdural hematoma is an increase in pressure within the skull that happens when blood collects in the space between the skull

Syncope is a loss of consciousness (fainting) that occurs when blood pressure drops very low and not enough blood reaches the

The possibility of suicide is most serious when a person has a plan for suicide. A plan for suicide includes: Having the means

A person who is susceptible (or has susceptibility) is easily affected by a disease, is more likely to get a disease, or lacks

Supraventricular tachycardia (SVT) is a very fast heartbeat that happens from time to time because of a problem with your heart's

Syphilis is a sexually transmitted infection (STI). It's usually spread through sexual contact. But it can also spread to the

Sudden infant death syndrome (SIDS) is the death of a baby who is younger than 1 year old without a known cause. Typically, a

The symptoms of depression may be hard to notice at first. They can be different from person to person. The two most common

Sprue is a disorder in which the intestines are unable to absorb nutrients from food. It can cause loss of appetite, diarrhea