A peanut allergy is an immune system reaction that occurs when the body mistakenly identifies proteins in peanuts as harmful. This can lead to symptoms ranging from mild hives and stomach upset to severe reactions like anaphylaxis, which can be life-threatening. People with this allergy must avoid peanuts and products containing them. Diagnosis typically involves skin tests or blood tests conducted by a healthcare professional. Management includes strict avoidance of peanuts and carrying an epinephrine auto-injector for emergencies. Education about reading food labels and recognizing symptoms is crucial for those affected by a peanut allergy.