Allergic cough is a very common type of cough clinically, with many complex triggers. Some triggers may be related to exposure to allergens in the environment, while others may be due to oral medications or certain foods that cause an allergic cough. Therefore, depending on the different triggers, some cases of allergic cough might persist even after removing the allergen, as the severity of allergic cough varies. For mild allergic coughs, some patients may see gradual improvement in symptoms shortly after avoiding the allergen. However, most patients with allergic cough might continue to experience a persistent dry cough even after avoiding the allergen.