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Sjögren's syndrome (say "SHOH-grins") is a disease in which the immune system attacks the body's glands that make moisture. This

Sickle cell disease is a blood disorder in which the body produces an abnormal type of the oxygen-carrying substance hemoglobin in

Shock may quickly occur after a sudden illness or injury. When the body loses too much blood or fluid, there is no longer enough

Shock is a life-threatening condition. Immediate medical care can make the difference between life and death. Adults and older

Sickle cell crisis is a painful episode that may begin suddenly in a person with sickle cell disease and may last for up to a few

Sickle cell trait occurs when a person inherits a sickle cell disease gene. People with sickle cell trait rarely have symptoms of

Immediate medical care may be needed if a headache, vomiting, fever, or a seizure occurs along with another serious illness

An eye injury may occur at the same time as a facial injury. Symptoms that mean an eye injury may be more serious and require

Symptoms of a stroke or transient ischemic attack (TIA) happen quickly. A stroke or TIA may cause: Sudden numbness, tingling

Ear infection symptoms usually involve discomfort inside the ear or ear canal or on the skin of the ear. Someone with an ear