Symptoms of allergic reaction to nuts Nut allergy symptoms usually develop rapidly after a person eats or has exposure to nuts. Symptoms can range from a mild runny nose to the life threatening symptoms of anaphylaxis. 1 allergic reaction in mouth 2 almonds Although peanuts have the word nut in their name, they aren’t nuts. Peanuts are legumes and, unlike tree nuts, grow underground. Although peanuts are not tree nuts, people with a. 3 signs of an allergic reaction to food 4 Signs of a nut allergy can include: Hives (urticaria) on your skin Swollen lips Skin rash Runny nose Tingling in your mouth or throat, or a tight feeling in your throat Stomach pain, nausea. 5 Abdominal pain, diarrhea, nausea or vomiting Dizziness, lightheadedness or fainting Anaphylaxis In some people, a food allergy can trigger a severe allergic reaction called anaphylaxis. This can cause life-threatening signs and symptoms, including: Constriction and tightening of the airways. 6 Rapid pulse Dizziness, lightheadedness or loss of consciousness When to see a doctor Talk to your doctor if you have had any signs or symptoms of peanut allergy. Seek emergency treatment if you have a severe reaction to peanuts, especially if you have any signs or symptoms of anaphylaxis. 7 tomatillo allergy symptoms 8 LTP allergy symptoms can include swelling of the eyes, mouth and throat, severe gastrointestinal pain, rash and difficulty breathing. 9 Some food allergies can be severe, causing potentially life-threatening of food reactions are caused by nine allergens: peanuts, tree nuts, eggs. 10