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The seroconversion period is a time during which a person who has an infection does not test positive for it. This period occurs

Serum sickness is an unusual reaction to any foreign substance in the body. Venom from insect stings or spider bites and medicines

Severe vomiting can mean that: You vomit more than 10 times in 24 hours. For at least 24 hours, you vomit every time you try to

Sexually transmitted infections (STIs) are infections spread by sexual contact. If you're pregnant, you can also spread them to

Severe vaginal bleeding means that you are soaking 1 or 2 pads or tampons in 1 or 2 hours, unless that is normal for you. For most

A silent heart attack is one in which a person does not feel typical symptoms of a heart attack, such as: Chest pain or pressure

A sitz bath is a shallow warm water bath used to promote healing and relieve pain or itching around the bottom, such as for

Sinusitis is an inflammation of the mucous membranes inside the nose and sinuses. Sinuses are the hollow spaces in your skull

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