There are many ways to determine viral colds, such as through the onset of the season, clinical symptoms, laboratory tests, etc., need to analyze specific problems. 1. Season of onset: viral colds usually occur in winter and spring. 2. Clinical Symptoms: Typical symptoms of viral influenza are acute onset, nasal congestion, cough and sore throat. People suffering from influenza may also have fever, body aches, diarrhea, loss of appetite and so on. 3. Laboratory tests: People with viral influenza usually have elevated lymphocyte ratio and low or normal white blood cell count in routine blood tests. Nucleic acid testing of respiratory specimens can also be performed to clarify the pathogen. After developing a viral cold, it is recommended to drink plenty of fluids and rest, and recovery is usually possible in about a week. If symptoms worsen or other discomforts occur during the process, prompt medical attention is recommended.