There is a type of fibrosis that heals, learn about it in this video: Hypersensitivity pneumonitis, also known as extrinsic allergic alveolitis, is an inflammatory lung disease that occurs when the body overreacts to an irritant. This irritant, called an allergen, can be inhaled, ingested, or injected. When a person inhales an allergen, the immune system releases an inflammatory response. This inflammatory response can cause damage to the lungs, which can lead to shortness of breath, coughing, and other symptoms. There are several types of hypersensitivity pneumonitis, each with its own causes and symptoms. The most common types of hypersensitivity pneumonitis are: Occupational hypersensitivity pneumonitis: This type of hypersensitivity pneumonitis occurs when a person is exposed to an allergen in the workplace. Common occupational allergens include dusts, fumes, and vapors. Drug Hypersensitivity Pneumonitis: This type of hypersensitivity pneumonitis occurs when a person is allergic to a drug. The most common drugs that cause hypersensitivity pneumonitis are antibiotics, sulfa drugs, and cancer treatment drugs. Inhalation Hypersensitivity Pneumonitis: This type of hypersensitivity pneumonitis occurs when a person is exposed to an allergen in the environment. Common environmental allergens include mold, mildew, and bird dust. Symptoms of hypersensitivity pneumonitis may vary depending on the type of illness. Common symptoms include: Shortness of breath Cough Fever Chest pain Fatigue Weight loss The diagnosis of hypersensitivity pneumonitis is based on a medical history, physical examination, and diagnostic tests. Common diagnostic tests include: Chest X-ray: A chest X-ray may show changes in the lungs, such as thickening of tissues or fluid buildup. Chest CT scan: A chest CT scan can provide more detailed images of your lungs than a chest X-ray. Pulmonary function tests: Pulmonary function tests can measure your lungs' ability to breathe. Allergy tests: Allergy tests can help identify the allergen that's causing your illness. Treatment for hypersensitivity pneumonitis depends on the severity of your illness. Treatment may include: Medications: Medications used to treat hypersensitivity pneumonitis include corticosteroids, immunosuppressants, and antibiotics. Oxygen therapy: Oxygen therapy may help people with breathing difficulty. Surgery: In severe cases, surgery may be needed to remove damaged lung tissue. The outlook for hypersensitivity pneumonitis varies depending on the type of illness and the severity of your symptoms. In general, the illness is more severe in older people and in people with underlying lung problems. The author of this video is Abraham Alí Munive, an internist, pulmonologist and intensivist. He currently works as Medical Director of the Colombian Pneumology Foundation www.neumologica.org, and is a professor at the Universities of Rosario and Sabana in Bogotá, Colombia. If you want to know more about the author, you can subscribe to his blog www.abrahamali.com or www.pulmoncritico.co. If you want to know more about the world of pulmonology and expand your knowledge of lung diseases, go to the website https://pulmoncritico.co. Pulmón Crítico/ Abraham Alí's social networks: / abrahamalimd https://pulmoncritico.co / abrahamalimd / abrahamalimd / abrahamalimd https://about.me/abrahamali