Colds are caused by respiratory viruses such Influenza virus. More severe cases can be caused by Respiratory Syncytial Virus (RSV). These annual virus infections are associated with the winter season and cold weather.
Symptoms include fever, nasal congestion, runny nose, post-nasal drip, cough, sore throat, and voice changes.
Comfort measures include warm showers, warm clothing, hydration, warm fluids (soup, cider, etc), steam, Vitamin C, and rest.
Saline sinus rinses are extremely beneficial with proper use and technique.