Different Types of Allergies
Different Types of Allergies = When do allergies occur? Allergies usually do not occur at the first exposure. When a person is exposed to an allergen for the first time, the body develops molecules called antibodies against the invading proteins. This is called an immune response. When exposed to the allergen again the immune system produces large amounts of antibodies that lead to break down of mast cells that contain chemicals like histamine. This leads to the features of allergies. This process is known as sensitisation. Sensitization may take days to years. Sometimes sensitization develops as the person affected shows symptoms but never fully develops the allergy to the allergen. Symptoms of allergy Symptoms of allergy include: sneezing shortness of breath wheezing runny nose and eyes pain over the sinuses (at the bridge of the nose, near the eyes, over cheeks and at the forehead) coughing skin rashes (nettle rashes or hives) swelling of the lips or face ...