lung

These mutations lead to thick mucus buildup in the lungs, resulting in chronic infections and long-term lung damage.

Beth Ashton, 25, weighed less than her four-year-old sister, had a perforated lung and her bladder had "completely collapsed" by the time she died last November.

Researchers at Mayo Clinic have uncovered a molecular "switch" inside lung cells that determines when the cells focus on repairing tissue and when they shift to fighting infection.

They measured everything that could be measured—his heart, his lung capacity, how he absorbed oxygen.

Winter had lung cancer but continued working and attending local water meetings even as her health declined.