Simple cases of colds accompanied by coughing phlegm cannot distinguish between cold-induced colds and heat-induced colds. Clinically, patients with heat-induced colds often have yellow phlegm when coughing occurs, and heat-induced colds are more common in summer. Patients will also experience fever, chills, and sore throat among other clinical symptoms. Wind-cold colds clinically manifest with nasal congestion and a runny nose, usually with clear nasal discharge, as well as fever, itchy throat, and dry cough. When patients cough, it is typically characterized by clear phlegm. Therefore, if one simply states that a cold involves phlegm, it is not possible to differentiate between wind-cold cold and wind-heat cold.