- The common cold is a mild viral infection of the upper respiratory tract, including the nose and throat, and is also referred to as acute nasopharyngitis or acute rhinitis.
- More than 200 types of viruses can cause the common cold, with rhinovirus being a common cause. Viruses can be transmitted through the air, close contact, and contaminated surfaces.
- When viruses infect the upper respiratory mucosa, local inflammation and immune responses occur, leading to nasal congestion, runny nose, throat irritation, and coughing.
- Representative symptoms include sneezing, nasal congestion, runny nose, sore throat, cough, and headache.
- The risk of developing a cold varies depending on the season and the degree of exposure; adults may experience it about 2–3 times per year on average, while children may experience it more frequently.
- Symptoms typically begin 2–3 days after infection and can last for 2–14 days, improving within 1–2 weeks in many cases.
- A typical common cold without complications is diagnosed clinically based on symptoms and examination, and causative virus testing is not necessary for all patients.
- If dyspnea, dehydration, fever lasting more than 4 days, symptoms that do not improve for more than 10 days, or worsening after improvement occur, one must evaluate other infections or exacerbations of underlying diseases rather than assuming it is only a common cold.
- The basics of management are rest and fluid intake, and discomfort can be reduced through humidification, warm saltwater gargles, and saline nasal irrigation or spraying.
- There is no established treatment to eliminate the common cold, and antibiotics are not effective against viral colds; therefore, they are generally not used for the purpose of treating a cold.