The part of the body affected by allergies is typically the immune system, though symptoms can manifest in various organs. When an allergen enters the body, the immune system mistakenly identifies it as a threat, prompting an inflammatory response. This results in symptoms such as sneezing, itching, or rashes, commonly affecting the respiratory system, skin, and digestive tract. In severe cases, allergies can lead to anaphylaxis, a life-threatening reaction that affects breathing and cardiovascular function. Proper management is crucial for allergic individuals.