Lung infections are primarily caused by various microorganisms, including viruses (such as influenza viruses or those causing COVID-19) and bacteria. Fungi and parasites can also induce lung infections, though they are less common. These infections can manifest with a range of symptoms, from mild to severe, including cough and fever. The severity of the illness often depends on the individual's immune system.

Several distinct types of lung infections are recognized, each with specific characteristics:

Pneumonia: Clinically defined as inflammation and infection of the lungs, pneumonia is the most prevalent type of lung infection and a significant health concern. In Turkey, it ranks as the fifth leading cause of death. Prompt medical treatment is essential.

Bronchitis: Characterized by the inflammation of the bronchial tubes, bronchitis also contributes to the spectrum of lung infections.

Bronchiolitis: This condition involves the inflammation of the bronchioles (small airways in the lungs). While Respiratory Syncytial Virus (RSV) is the most frequent cause, other viruses can also be responsible. Bronchiolitis is particularly common in children.

Influenza (Flu): A highly contagious and commonly occurring seasonal viral infection, influenza is a widespread cause of lung infections.

COVID-19: The global coronavirus pandemic significantly increased the incidence of respiratory diseases, establishing COVID-19 as a prominent cause of lung infections.

Pertussis (Whooping Cough): While preventable by vaccination, pertussis remains a public health concern, especially affecting infants and young children, and is a recognized cause of lung infections.

Tuberculosis: This bacterial infection, widespread globally, is another significant cause of lung infections.