If you have chronic obstructive pulmonary disease (COPD), your airways may be inflamed. It may be hard to take deep breaths and get enough oxygen.

You wouldn’t think you could live when both your heart and lungs are failing, but there is technology that makes it possible.

These can cause inflammation and scarring that make it harder for you to move oxygen out of your lungs and into the rest of your body. If you’ve put on a lot of weight, especially around your belly, ...