Colds can cause a variety of symptoms, including influenza and the common cold, but are generally referred to as the common cold. Most common colds are caused by viral infections, including rhinovirus, adenovirus, respiratory syncytial virus, coxsackievirus and coronavirus. Typical symptoms of colds include nasal congestion, runny nose, sore throat and cough, and most colds may also have fever, as well as fever-induced dizziness, headache, fatigue and even muscle aches. Gastrointestinal colds are mostly caused by coxsackievirus infection and often have symptoms such as nausea, vomiting, bloating and diarrhea. Influenza is caused by influenza virus infection, and its typical symptoms include chills, high fever, dizziness, headache, muscle aches and weakness, etc. In severe cases, viral pneumonia can be complicated by chest tightness, shortness of breath and difficulty in breathing. Therefore, although the cold is self-limiting, if the symptoms are severe, timely intervention is needed to improve the symptoms with cold medication.