Pulmonary hypertension
The disease makes it hard to breathe. Some people with the disease need extra oxygen. This disease can also make a person dizzy and become easily tired. Some people with the disease faint easily. The symptoms get worse when exercising or working hard. Pulmonary hypertension is a serious disease, and it can be fatal. The disease makes it harder for the heart to pump blood. Because the heart has to work harder, it can also become sick. Some people who are very sick may need a lung transplant or a heart-lung transplant to live.