Description

Hypersensitivity pneumonitis (HP) is a lung disease causing inflammation (swelling and sensitivity) of the lung tissue. This inflammation makes breathing difficult. It can lead to irreversible lung scarring over time. HP results from breathing in specific environmental allergens. Allergens are substances that cause an allergic reaction in the body. These allergens may be present at home, at work, or in nature. Bird feathers and droppings, and household mold are examples of common allergens. What are the symptoms of hypersensitivity pneumonitis? The symptoms of HP depend on whether the disease is acute or chronic. In general, symptoms of acute, or sudden, HP last between 12 hours and several days. Symptoms of acute HP may include: Shortness of breath Dry cough Chest tightness Chills Fatigue Fever The symptoms of chronic HP may include: Shortness of breath, especially with exertion or activity Cough Fatigue Weight loss In rare cases, chronic HP leads to irreversible, permanent scarring of the lung tissue. This condition is called pulmonary fibrosis. This serious disease causes symptoms resulting from too little oxygen reaching body tissues. Pulmonary fibrosis symptoms may include: Shortness of breath Fast, shallow breathing Dry, hacking cough Weight loss Fatigue Finger and toe clubbing (rounding and widening)