An allergy is a hypersensitive reaction of the immune system to certain substances that are normally harmless. These substances, also known as allergens, can take various forms, for example pollen, animal hair, mold spores, food or medication. Allergies are widespread and can affect people of all ages. Symptoms can range from mild to severe and range from skin rashes, itching, runny nose and sneezing to breathing difficulties and life-threatening conditions such as anaphylactic shock. An allergy is usually diagnosed by means of a skin test or blood test in which the patient is tested for various allergens. Once the allergy-causing substances have been identified, the doctor can draw up a treatment plan. The most important measure for treating allergies is to avoid contact with the allergens in question. If this is not possible or sufficient, antihistamines or medications containing corticosteroids may be prescribed to relieve symptoms. In some cases, immunotherapy may also be recommended, where the body is slowly acclimatized to the allergy-causing substance to prevent a hypersensitivity reaction. It is important that people with allergies keep an eye on their environment and avoid their triggers. This may mean avoiding certain foods or medications, using special bedding or limiting contact with pets. Good hygiene, regularly cleaning the air and living space and wearing a protective mask can also help to reduce allergic reactions. Overall, an allergy can affect a person’s daily life and lead to discomfort and restrictions. However, it is important to know that there are treatment options available and that with proper management, the effects of allergies can be minimized. Consulting with an allergist and adapting one’s environment accordingly can help enable a life without constant allergic reactions.