Allergic cough does not cause fever, because the main typical clinical condition of allergic cough is cough variant asthma, a specific type of bronchial asthma. The main cause is the invasion of allergens such as cold air, pollen, oil smoke, dust mites, sulfur dioxide, ammonia and other industrial emissions and pollutants, as well as the consumption of nutty foods and other high protein diets such as milk, soy milk, eggs and peanuts. When the body ingests them, there is a state of airway hyperreactivity, with significant congestion, edema and even varying degrees of contraction of the bronchial smooth muscle, causing a persistent, irritating, dry cough without any infectious factors present, so there are no symptoms of elevated body temperature. When these allergens are removed and appropriate anti-allergic or even combined bronchodilator medications are given, the cough symptoms will resolve until they disappear.