Pulmonary heart disease results from lung disorders that cause high blood pressure within the lungs. Normally blood flows from the heart, into the lungs, back to the heart, and then out to the rest of the body. Certain lung conditions can cause the blood pressure within the lungs to be abnormally high. This pressure causes the right side of the heart to work harder, which can injure and tire out the heart muscle. When the heart muscle tires out, this is called “heart failure”. Pulmonary heart disease is fairly rare and those who have it also have a lung disorder. Pulmonary heart disease can be diagnosed by a physician using imaging tests and various studies of heart function. Pulmonary heart disease is usually treated by addressing underlying causes. Certain medications and use of oxygen may also help to slow the progression of the disease.