Allergy: Overview

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  • Poison Ivy, Oak, or Sumac - Topic Overview

    09/25/07, Healthwise

    Poison ivy, poison oak, and poison sumac are plants that can cause a skin rash called allergic contact dermatitis when they touch your skin. The red, uncomfortable, and itchy rash often shows up in lines or streaks and is marked by fl

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  • Environmental Illness

    11/01/07, Healthwise

    Chemicals, fumes, pollution, allergens, and other health hazards are common in our environment, and sometimes they can make us sick. Maybe you have mysterious headaches that only occur on weekends. Or you develop nausea and a rash after

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  • Spring Means Sinusitis

    04/08/08, Johns Hopkins University

    Allergies are immune reactions to something in the environment. For allergic sinusitis, it is typically something in the air.

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  • Allergies to Insect Stings - Home Treatment

    01/22/08, Healthwise

    Knowing which insect venom triggers your allergies and avoiding those insects is the best way to avoid allergic reactions to the stings. Unfortunately, it can be difficult to avoid insects, especially if you spend time outdoors.

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  • Food Allergies - Topic Overview

    04/05/07, Healthwise

    This topic has general information about food allergies. If you would like more specific information about peanut allergy, see the topic Peanut Allergy.

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  • Food Allergies - What Increases Your Risk

    04/05/07, Healthwise

    You have a greater chance of developing food allergies if you:

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  • Lactose Intolerance - Topic Overview

    08/15/07, Healthwise

    Lactose intolerance means the body cannot easily digest lactose, a type of natural sugar found in milk and dairy products.

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  • Peanut Allergy

    04/05/07, Healthwise

    A peanut allergy is a reaction that occurs when your body mistakenly identifies peanuts as harmful substances. When you eat peanuts or food containing peanuts, your immune system—the body's natural defense system that fights infection

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  • Allergic Rhinitis

    08/08/07, Healthwise

    Allergic rhinitis, often called allergies or hay fever, occurs when your immune system overreacts to particles in the air that you breathe—you are allergic to them. Your immune system attacks the particles in your body, causing sympto

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