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An allergy is defined as an overreactive response created by the body's defense system to fight infection. For instance, a body's immune system is normally protective of the body from virus and bacteria through antibodies. But when an allergic reaction takes place, the immune system fights normally harmless objects in a manner wherein they are considered severely threatening to the body. The overreaction results in reactions such as a rash, itchy eyes, a runny nose, trouble breathing, nausea and diarrhea.

Allergic reactions may not occur the first time someone is exposed to an allergen, or an allergy-producing substance. An instance is when you are stung by bee, and get only redness and pain from the sting.

The second time you are stung, you may then have trouble breathing: a phenomenon known as hives (caused by a response of the immune system).
People will have a problem with allergies and allergic reactions somewhere in their lives, either mild or dangerous. Many reactions are mild and home treatment can be a relief to these symptoms. Allergic reactions worsen as severe allergic reaction takes place; when allergies result into nosebleeds, coughing, etc.; or when home treatment is ineffective.

Allergies can be seen to occur along with other diseases including asthma, ear infections, sinusitis and sleep apnea.
Some common allergies include:
Medicine allergies: Many prescription and nonprescription medicines can result in an allergic reaction. Allergic reactions are common, and unpredictable. How serious the allergic reaction will be can vary.

Food allergies: These are more common in children than in adults. Food allergies appear to be common in persons who have developed an inherited tendency to develop allergic conditions. These people  appear likely to have asthma and other allergies.

Allergies to animals, more likely caused by breathing problems than skin problems, including dead skin , urine, dried saliva, or hair.

Allergies to insect venom: Once stung by an insect, poisons and other toxins in the insect's venom will penetrate your skin. It appears to be normal to have swelling, redness, pain, and itching at the sting. Allergic reaction occurs when the body system overreacts to the venom of insects.

Seasonal allergies show up same time during the year and caused by exposure to pollen from trees, grass and weeds. The most common seasonal allergy would be hay fever.

Allergies to natural rubber (latex): Some people get allergic reactions after repeated contact with latex, and latex gloves in particular.

Allergies that result from an exposure to inhaled substance in the workplace, or occupational asthma.

Allergies in cosmetics, such as artificial nails, henna tattoos, and hair extensions.

Allergies that take place for more than 9 months of the year are referred to as perennial allergies.

Year-round symptoms (chronic allergies) are very probable to take place from being exposed to dande,r mold or dust.