A cough is a reflex that expels air from your airways. A cough is a common symptom of many different illnesses. Coughs come in a variety of forms. For example, you may see coughs referred to as either productive or nonproductive. A productive cough is a cough that brings up mucus or phlegm, while a nonproductive cough is dry. The common cold is an upper respiratory tract infection that can be caused by more than types of viruses, although rhinoviruses are the most common type of virus that cause a cold.
According to the Centers for Disease Control and Prevention CDC , a cough, along with other typical cold symptoms, usually starts within 2 to 3 days of a person contracting a cold virus. A cough can often stick around for 10 to 14 days and is usually the last cold symptom to go away. In some cases, a cough may last longer than 2 weeks.
Like the common cold, the flu is also an upper respiratory tract infection. There are seasonal epidemics of flu every fall and winter around the world. The symptoms of flu typically ease after 3 to 7 days. However, the CDC notes that a cough can last for 14 days or longer, particularly in older individuals and people who have an underlying lung disease. Bronchitis is an illness in which the large airways in your lungs bronchi become inflamed.
Many cases of bronchitis are acute, or temporary. Symptoms, including a cough, usually resolve in less than 3 weeks. Sometimes, bronchitis can become chronic. In these cases, a daily productive cough can persist for 3 months and may come back year after year. Pneumonia is a condition in which the tiny air sacs in your lungs alveoli become inflamed.
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