How quickly does a peanut allergy show up?
Symptoms usually start as soon as a few minutes after eating a food and as long as two hours after. In some cases, after the first symptoms go away, a second wave of symptoms comes back one to four hours later (or sometimes even longer). This second wave is called a biphasic reaction.
Symptoms of an allergic response to peanuts will usually start within minutes of exposure, and they can include:
- Tightening in the throat.
- Shortness of breath or wheezing.
- Skin reaction such as hives or redness.
- Tingling or itching in the mouth or throat.
- Diarrhea, nausea, stomach cramps or vomiting.
- A runny nose.
- Most patients didn't outgrow their tree-nut allergies. But nearly one in 10 did, some of whom had had a severe reaction in the past to tree nuts, the study shows. Kids were more likely to have outgrown their tree-nut allergy if they were no longer allergic to peanuts.
- No - it's not possible to be allergic to peanuts but not peanut butter. Studies show that most individuals with peanut allergy can safely eat peanut oil (but not cold-pressed, expelled or extruded peanut oil – sometimes represented as gourmet oils).
- For someone with a food allergy, eating or swallowing even a tiny amount of a particular food can cause symptoms such as skin rash, nausea, vomiting, cramping, and diarrhea. Rarely, a severe allergic reaction can cause a life-threatening set of symptoms called anaphylaxis, or anaphylactic shock.
In those who are severely allergic, reactions to peanuts can occur from ingesting just a trace amount. This can cause anxiety, especially with the parents of peanut allergic children. But did you know that touching, smelling, or inhaling airborne particles from peanuts does not cause a severe reaction.
- Peanuts are legumes and are not related to tree nuts (almonds, walnuts, cashews, etc.). However, about 35% of peanut-allergic toddlers in the U.S. have or will develop a tree nut allergy. Doctors often recommend that young children avoid tree nuts if they are allergic to peanuts.
- The most severe allergic reaction to peanuts is anaphylaxis — a life-threatening whole-body response to an allergen. Symptoms include impaired breathing, swelling in the throat, a sudden drop in blood pressure, pale skin or blue lips, fainting and dizziness.
- Tree nuts include, but are not limited to, almonds, Brazil nuts, cashews, chestnuts, filberts/hazelnuts, macadamia nuts, pecans, pistachios, pine nuts, shea nuts and walnuts.
Updated: 2nd October 2019