Allergies occur when the body's immune system overreacts to outdoor stimulants such as mold spores and pollen. Learn about symptoms and treatment.
The common cold is probably the most universal illness. It is a viral infection of the upper respiratory tract, which includes the nose and throat area.
Allergic contact dermatitis is the skin's reaction to an irritant—anything from poison ivy to certain fabrics can cause your skin to flare. Learn about symptoms and treatment.