Coughs caused by viral infections can also have phlegm, which is a secretion in the respiratory tract. Whenever there are viral and bacterial stimuli, it will cause an increase in secretions. Viral infections may also be accompanied by recurrent fever, if the fever persists above 37.3 ℃, it is recommended to improve the chest X-ray, blood routine examination, to exclude bronchopneumonia. Viral infections are self-limiting diseases and can be cured in 3-7 days, there is no specific anti-viral drug, but heat-clearing and detoxifying Chinese patent medicines generally have anti-viral effects, you can choose to use Fritillariae Vulgaris Oral Liquid, Compound Fresh Bamboo Liquid, Pu Dilan Oral Liquid and so on.