what is peanut allergy? If you are allergic to peanuts, your immune system will attack whenever it senses the proteins in peanuts. What reaction does your body show to peanuts? This will cause chemicals to be released, which can cause symptoms like itchy hives, feeling sick, or a swollen face. Some people are very allergic to peanuts. When they come in contact with even a small number of peanuts, their whole bodies react in a way that could kill them. This is called anaphylaxis. When someone with a severe allergy eats peanuts, they often have an anaphylactic reaction right away. Symptoms can sometimes show up minutes or hours after being exposed. You can get treatment for a severe reaction, think you're fine, and then have second reaction hours or days later, even if you haven't eaten peanuts since the first one. Delayed or late phase (biphasic) anaphylaxis is a reaction that happens a long time after being exposed. Find out why this kind of response is so dangerous and how you or your child can keep it from happening. 
If you have an allergic reaction to peanut butter, you might get hives or eczema on your skin. Some people may have trouble with their stomach or intestines, or they may have other allergy symptoms like coughing and sneezing. In some cases, the reaction can be very bad, like when the face swells up and makes it hard to breathe. Peanut butter and other foods often make people break out in hives or have other skin reactions. Most of the time, a skin reaction is a mild reaction. A person may get hives or red bumps on their skin, or their face may swell up a little. When an allergic person comes in contact with peanuts or peanut butter, they may also feel itchy or tingly. Eczema, which causes red, flaky patches on the skin, is another common reaction to certain foods. When they eat peanut butter, some people have trouble with their stomachs. They might throw up or have diarrhea, and they might also have stomach pains and cramps. Most of the time, the reaction goes away once the person has stopped eating peanut butter. If a person is allergic to peanuts, they may show more general signs of an allergic reaction. He might get watery eyes and a stuffy or running nose. People who are allergic to peanuts can sometimes have an asthma attack when they eat peanut butter. He can wheeze, have trouble getting enough air, and cough. 
Some people may feel like they are going to pass out or have pain in their chest. People who are allergic to peanuts often have a very bad reaction, even if they only eat a small number of peanuts or peanut butter. People with this allergy often have a reaction called anaphylaxis. A sudden drop in blood pressure and swelling in the throat, which makes it hard to breathe, are signs of anaphylaxis. A person might pass out or feel very sick. Most of the time, the heart rate goes up. When someone has anaphylaxis, he needs to go right away to the emergency room. A person with a severe peanut allergy will usually carry an epinephrine injector, which he can use to give himself an injection in the thigh if he has a severe reaction. Antihistamines that can be bought without a prescription may help people who only have mild reactions. Avoiding peanut butter is the best way to keep from having an allergic reaction to it. A person who is allergic to peanuts needs to carefully read food labels and only eat foods that are guaranteed not to have any peanut products in them. Some people also need to be careful when they eat tree nuts like almonds, because they may cause the same reaction. 
A delayed anaphylactic reaction can happen up to an hour or more after eating peanuts. Some people don't start to feel bad until a few days after they got sick. The symptoms of a severe reaction can be more or less severe than the symptoms of an immediate reaction. About 2% of the people who went to hospital emergency rooms because of an allergic reaction had a second, later reaction. On average, people had that delayed reaction 15 hours after they were treated for the first time. Another study found that about 15% of children had a second serious allergic reaction hours after their first one. Some allergic reactions aren't too bad, but anaphylaxis is very dangerous. Your airways can get so tight that you can't take a breath. People with anaphylaxis can die if they don't get medical help within 30 minutes. People who have been treated for an allergic reaction and seem to be fine can still have a reaction hours later. Natalie Giorgi, then 13 years old, took a small bite of a peanut-filled dessert while on vacation with her family in 2013. She was given three doses of epinephrine, a drug that can help stop an allergic reaction. Natalie seemed fine afterward, but she died later that evening from a severe allergic reaction. Some allergic reactions aren't too bad, but anaphylaxis is very dangerous. Your airways can get so tight that you can't take a breath. People with anaphylaxis can die if they don't get medical help within 30 minutes. 
People who have been treated for an allergic reaction and seem to be fine can still have a reaction hours later. Natalie Giorgi, then 13 years old, took a small bite of a peanut-filled dessert while on vacation with her family in 2013. She was given three doses of epinephrine, a drug that can help stop an allergic reaction. Natalie seemed fine afterward, but she died later that evening from a severe allergic reaction. An allergist should be seen by anyone who has had a reaction to peanuts. They will examine your medical history as well as your symptoms, provide you with guidance on how to steer clear of peanuts, and assess whether or not you require an epinephrine auto-injector to have on hand in case of an emergency.
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