Diseases and Conditions

Know how to prevent, treat and control the symptoms of various diseases and medical conditions. We explain what's happening in your body when disease strikes, and what you can do to feel better faster.

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Osteoarthritis is the result of erosion of your joints, whereas rheumatoid arthritis is an auto-immune disorder. Learn more about the difference between osteoarthritis and rheumatoid arthritis from this article.

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There are many myths about pet allergies out there. Take a look at some common myths about pet allergies and find out what is actually true.

By Linnea Lundgren & Jeff Wald

Sinus problems can be caused by an allergy to gluten. Find out more about how gluten allergies cause sinus problems by reading this article.

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If you're allergic to eggs, it means you have to avoid them altogether. Learn what you can substitute for eggs if you have an egg allergy in this article.

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The only way to manage a gluten allergy is by eliminating gluten from your diet. Find out more about what foods people with gluten allergies must avoid from this article.

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Not all people who are allergic to gluten have celiac disease. Find out more about the differences between celiac disease and a gluten allergy from this article.

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Many people suffer from allergies to pet dander. Learn whether an allergy shot will help with an allergy to pet dander in this article.

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A severe skin rash, known as Dermatitis Herpetiformis, is one of the symptoms of a gluten allergy. Find out more about skin rashes caused by gluten allergies from this article.

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Children may display a range of symptoms to gluten allergies. Find out more about gluten allergy symptoms in children from this article.

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Many people with gluten allergies experience uncontrolled weight gain. Find out more about how gluten allergies can cause weight gain from this article.

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One of the possible reactions to a peanut allergy is anaphylaxis, which can cause death. Learn how many people die each year from peanut allergies in this article.

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Since peanut allergies can be very dangerous, it's important to know what you're eating. Learn whether it's safe to eat peanut oil if you have a peanut allergy in this article.

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Fish is a good source for healthful omega-3 fatty acids. Learn whether there's a connection between fish allergies and omega 3 in this article.

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Gluten allergies can be mild to life-threatening. Find out about desensitizing a gluten allergy from this article.

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Some people have unpleasant reactions to certain artificially colored foods. Learn about food dye allergies in this article.

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Some common food allergies in infants are to milk, eggs, nuts, soy and wheat. Learn what some common food allergies in kids are in this article.

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Allergic contact dermatitis is the allergic reaction you see in your skin when you touch certain substances. Learn about the common skin allergies to metal in this article.

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Soy allergies are particularly common in young children. Learn some of the common soy allergy symptoms in this article.

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Peanut allergies can cause a variety of reactions. Learn about the common symptoms of peanut allergies in this article.

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Peanut allergy reactions can range from mild to life-threatening. Learn what foods are safe to eat if you have peanut allergies in this article.

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Some signs of a latex allergy in newborns are symptoms of the skin or respiratory system soon after they come into contact with latex. Learn about signs of a latex allergy in newborns in this article.

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Food allergies are responsible for a wide variety of symptoms. Learn whether there are food allergies that cause earaches in this article.

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Food allergies can cause a variety of symptoms. Learn whether any food allergies cause edema in this article.

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There are two tests you can take to diagnose latex allergies: the immunoglobulin E test and a skin prick test. Find out whether there are tests you can take to diagnose latex allergies in this article.

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Many kids suffer from ear infections, and peanut allergies are common, too. Learn whether a peanut butter allergy can cause an inner ear infection in this article.

By HowStuffWorks.com Contributors