From dry cough to phlegm does not necessarily mean that the symptoms are serious. When you have a cold, at first it is mainly a dry cough, with a sore throat and a fever, and as the disease develops it produces phlegm, and the symptoms gradually decrease, with less coughing and less coughing, which is a step in the right direction. If the systemic symptoms do not decrease, the fever is more severe, and the number of coughs increases, it is possible that the disease was caused by a previous viral infection, followed by a secondary bacterial infection. In addition to antiviral drugs, antibacterial drugs are also needed to cure active treatment, it is best to go to the hospital for examination, according to the results of the examination under the guidance of the doctor with medication. In the use of drugs at the same time also need to pay attention to diet and rest, if you do not pay attention to the body’s resistance to decline, affecting the recovery of the disease.