If there is nothing wrong with the examination just keep coughing, you need to consider common respiratory allergic reactions, such as allergic cough, also known as cough variant asthma, which is a special type of bronchial asthma. Since the cough may be basically normal with X-rays, CT or even MRI of both lungs, blood tests, and even respiratory function tests and pulmonary function tests, the most common clinical consideration belongs to cough variant asthma. The examination results of this disease can be relatively normal, but also check for allergen testing, which needs to clarify the allergens, such as pollen, oil smoke, even sulfur dioxide, ammonia, eating a high protein diet, including milk, soy milk, eggs, etc. that induces an allergic reaction, making the throat congested, edematous, and even with inflammatory secretions exuding, stimulating the throat to cough continuously without stopping. If anti-allergic drugs such as paracetamol and cetirizine are used, the symptoms will be reduced or even disappear, and a clear diagnosis can be obtained.