The duration of a cold, in the case of a common bacterial cold, may be around 1 week. The course of a viral cold may be slightly longer, in some cases up to 2 weeks. If the cold is caused by a combination of bacterial and viral infections, the duration of illness may be longer. If a cold is treated promptly and effectively, the duration of illness will be shortened accordingly and symptoms will be reduced. If effective treatment is not given in time, complications may even occur, such as complications of bronchitis, pneumonia, or even myocarditis and meningitis. In this case, the course of the disease will be longer and the symptoms will be significantly worse, and symptoms not only belonging to the respiratory system infection will appear. Cold is the most common clinical infection of the upper respiratory tract, and there are various pathogens of cold, including bacteria, viruses, mycoplasma, chlamydia, etc.