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Inflammation is the body's response to injury or infection. It may result in pain, swelling, redness, warmth, or loss of function

Infertility means not being able to get pregnant after trying for at least 1 year (or 6 months if you're over 35). It can be

Indigestion is a general term used to describe symptoms of stomach upset, particularly after eating. Most people have indigestion

Infectious arthritis (septic arthritis) is caused by a bacterial, viral, or fungal infection inside a joint. The infection may be

The incubation period is the time it takes for an infection to develop after a person has been exposed to a disease-causing

An inguinal hernia (say "IN-gwuh-nul HER-nee-uh") happens when tissue pushes through a weak spot in your groin muscle. This causes

Impetigo is a skin infection caused by bacteria. The infection often begins when bacteria that normally can be present on the skin

Immunoglobulin (also called immune globulin or gamma globulin) is a protein in human blood and tissue fluids. These proteins are

An impacted tooth is one that does not break through the gum. Impaction most often occurs with the third molars (wisdom teeth) or

The immune system is the body's natural defense system that helps fight infections. The immune system is made up of antibodies