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Allergies happen when the immune system reacts to a foreign substance that gets inside the body. These substances are known as allergens. They include pollen, bee venom and pet dander. Allergies also can happen due to certain foods and medicines that don't cause reactions in most people.
Anaphylaxis is a severe, life-threatening allergic reaction. It can happen seconds or minutes after you’ve been exposed to something you’re allergic to. Peanuts or bee stings are examples. In anaphylaxis, the immune system releases a flood of chemicals that can cause the body to go into shock.
For some people, an allergic reaction to a particular food may be uncomfortable but not severe. For other people, a food allergy reaction can be frightening and even life-threatening. Food allergy symptoms usually develop within a few minutes to two hours after eating the offending food.
Symptoms of a serious drug allergy often happen within an hour after taking a medicine. Other reactions, particularly rashes, can happen hours, days or weeks later. Drug allergy symptoms may include: Skin rash. Hives. Itching. Fever. Swelling. Shortness of breath. Wheezing. Runny nose. Itchy, watery eyes. Anaphylaxis
See your doctor as soon as possible if you experience signs or symptoms of penicillin allergy. It's important to understand and discuss what is an allergic reaction, what is a typical side effect and what you can tolerate in taking a medication.
An allergic response to peanuts usually occurs within minutes after exposure. Peanut allergy signs and symptoms can include: Skin reactions, such as hives, redness or swelling. Itching or tingling in or around the mouth and throat. Digestive problems, such as diarrhea, stomach cramps, nausea or vomiting. Tightening of the throat.
See a doctor if you or your child has signs or symptoms of a food allergy shortly after eating eggs or an egg-containing product. If possible, see the doctor when the allergic reaction is occurring. This may help in making a diagnosis.
Bee sting symptoms can range from pain and swelling to a life-threatening allergic reaction. Having one type of reaction doesn't mean you'll always have the same reaction every time you're stung or that the next reaction will be more severe.
Your healthcare professional helps you take steps to spot and stay away from your allergy triggers. Often, this is the most important step in preventing allergic reactions and curbing symptoms. Medicines. Depending on your allergy, medicines can help turn down your immune system's reaction and ease symptoms.
Pet allergy is an allergic reaction to proteins found in an animal's skin cells, saliva or urine. Signs of pet allergy include those common to hay fever, such as sneezing and runny nose. Some people may also experience signs of asthma, such as wheezing and difficulty breathing.