The symptoms of dry cough without a cold are clinically common mainly due to specific causes, caused by chronic inflammation of the airways, mainly in cough variant asthma, which is a special type of bronchial asthma. Triggering factors are not caused by cold but commonly by allergens, which include cold air, oil smoke, pollen, dust mites, and also foods eaten such as high protein diet, milk, soy milk, eggs. In addition, contact with flowers, trees, etc. may cause airway hyperreactivity, especially the pharyngeal mucosa appears obvious congestion, edema, and even cause airway lumen contraction, spasm, when the difficulty of breathing out will cause non-sputum dry irritating cough, generally clinical examination of allergens and lung function tests can be the initial clear diagnosis.