It is suggested to see an allergist if your allergies cause symptoms such as nasal congestion, sinus infections, difficulty breathing, or if you experience allergy symptoms or hay fever several months out of the year. When a trigger for allergies is suspected, it is not always easy to identify. In this case, a referral to an allergy specialist is recommended. Furthermore, if a resolution cannot be found with the avoidance of a trigger or the use of antihistamines, then referral to an allergist, immunologist, or dermatologist is also recommended. While on immunotherapy, allergies can improve over time. Therefore, it is recommended to seek the medical attention of an allergist if you are experiencing prolonged symptoms of allergies.