High pressure in the lungs usually means pulmonary hypertension, which happens when the blood vessels in the lungs become tight or damaged. If you also have a heart problem, it often means the heart (especially the left side) is not pumping or relaxing properly, causing pressure to build up in the lungs. This can lead to symptoms like breathlessness, fatigue, chest discomfort, or swelling in the legs. It is important to follow your doctor's treatment plan to prevent complications