sentence: Less blood goes to the lungs, so the blood gets less oxygen.
sentences_before: The heart can work so hard that it becomes sick. This is called heart failure. The sick heart cannot pump blood well.
sentences_after: This makes it hard to breathe. This gets worse when exercising or working hard.
concept_name: Less blood
headings: Pulmonary hypertension What goes wrong with the body
categories: Cardiology Pulmonology Diseases