Influenza, or the flu, is an epidemic caused by the influenza virus, often characterized by severe systemic symptoms such as chills, high fever, and body aches. However, the symptoms related to the nasal pharynx are relatively mild, such as light sneezing, runny nose, and nasal congestion. The common cold, often referred to as a cold or rhinitis, is also caused by viral infection and can be caused by various viruses such as rhinovirus, coronavirus, adenovirus, influenza virus, and parainfluenza virus. The general systemic symptoms of the common cold are relatively mild, such as fever, headache, and chills. Symptoms related to the ears, nose, and throat are more pronounced, including distinct sneezing, nasal congestion, runny nose, and throat discomfort.