You might look at the above question and think, “No, I’ve eaten peanuts for years.” But according to the American College of Allergy, Asthma, & Immunology, it’s possible to develop a food allergy at any point in your life. So, even if you’ve eaten peanuts and foods that contain or are made from peanuts for years, that doesn’t mean you can’t become allergic to peanuts during adulthood.
In addition, there are different symptoms of a peanut allergy (via Mayo Clinic). The one usually focused on (and for good reason, considering it’s life-threatening) is anaphylaxis, which has its own range of symptoms, like one’s pulse increasing, blood pressure dropping severely, and throat becoming swollen to the point that it makes breathing more difficult. Other symptoms of anaphylaxis can include the airways becoming constricted, lightheadedness, and dizziness. In addition, the person could lose consciousness. However, a peanut allergy can also cause symptoms that include a runny nose, itchiness around or inside the mouth and throat, hives, stomach cramps, diarrhea, nausea, and/or vomiting. But no matter what symptom or symptoms someone is experiencing, it’s important to seek immediate medical help.
If you think you might have a peanut allergy, a medical professional can perform a skin test and a blood test to help determine if you have an allergy. Typically, you’ll also be asked about your medical history. You might also be asked to keep a food diary and do an elimination diet.