The cause of eczema is not fully understood. But it's believed to be triggered by an overactive immune system that responds aggressively when exposed to irritants. Eczema is sometimes caused by an

Vaccines and allergy shots work similarly, where a small amount of allergen is given in increasing doses to a patient in order for them to build immunity to the allergen. This can take time and mainte

Contact dermatitis is a common type of rash. It causes redness, itching, and sometimes small bumps. You get the rash where you have touched an irritant, such as a chemical, or something you are allerg

Certain medications are known to cause allergies, in particular penicillin, with 8 percent of Americans reporting this allergy; other antibiotics can also cause an allergic reaction, such as sulfonami

Asthma is a serious disease causing wheezing, difficulty breathing, and coughing. Over a lifetime, it can cause permanent lung damage. About 16% of black children and 7% of white children have asthma

Millions of people suffer from allergies caused by every day exposures to agents such as dust mites, cat dander, and pollens. Agents encountered by workers can also cause allergic problems such as ast