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Explore comprehensive guides on hundreds of common and rare diseases and conditions from the experts at Mayo Clinic.
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May 17, 2024 · Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful, but some organisms under certain conditions may cause disease.
Dec 30, 2019 · Pneumonia is an infection that inflames the air sacs in one or both lungs, and can range in seriousness from mild to life-threatening. Pneumonia can affect anyone, but the age groups at highest risk are children younger than age 2 and people older than age 65.
Nov 29, 2016 · Chronic obstructive pulmonary disease, or COPD, is a collection of serious lung diseases that obstructs airflow from the lungs and causes breathing issues. Emphysema and chronic bronchitis are the conditions that most commonly contribute to COPD.
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