Nov 29, 2022 · You know what M.D. means, but what does D.O. mean? What's different and what's alike between these two kinds of health care providers?

Jun 13, 2020 · Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, …

Learn about polio epidemics and the development, approval and impact of the polio vaccine.

Learn about the COVID-19 pandemic as well as mRNA research, COVID-19 tests and treatments, and COVID-19 vaccine development and approval.

Mar 28, 2025 · Overview Chronic granulomatous (gran-u-LOM-uh-tus) disease (CGD) is a genetic condition in which infection-fighting white blood cells don't work properly. These white blood …

Jan 25, 2023 · Overview Knee pain is a common complaint that affects people of all ages. Knee pain may be the result of an injury, such as a ruptured ligament or torn cartilage. Medical …

Aug 31, 2023 · Dissociative disorders usually arise as a reaction to shocking, distressing or painful events and help push away difficult memories. Symptoms depend in part on the type of …

Oct 23, 2024 · Learn about causes of this common irritating skin condition and which treatments and self-care measures may provide relief.

May 2, 2025 · A healthcare professional often can diagnose dehydration from symptoms. For a child, a change in weight might be used in the diagnosis. To help confirm the diagnosis and to …

Feb 21, 2025 · Cracked heels, also known as fissures, can be a nuisance. They may lead to more-serious problems if left untreated. Treat them by giving your feet a little more attention. …