What causes pulmonary hypertension?

The pressure is measured in the blood vessels carrying blood from the heart to the lungs. Some cases begin in those vessels themselves. Others are linked to left-sided heart problems, long-term lung disease or low oxygen, or old clots that obstruct blood flow. A clinician may also look for connective-tissue disease, liver disease, medicines, or an inherited tendency.

High blood pressure elsewhere in the body is different from pulmonary hypertension, although a person can have both. Conditions such as heart failure, chronic kidney disease, obesity, and obstructive sleep apnoea may affect the heart-lung circulation and help guide the assessment.

Arrange a medical review if pulmonary hypertension is suspected or mentioned in a report. Your clinician may review breathlessness, fainting, chest discomfort, medicines, past clots, sleep symptoms, and family history. Tests can include an oxygen check, blood tests, an electrocardiogram, chest imaging, and an echocardiogram; further testing may be needed to identify the cause.

Do not stop prescribed treatment without advice. Bring a list of medicines and any history of heart, lung, kidney, clotting, or sleep-related problems.

Seek emergency help for severe or rapidly worsening breathlessness, fainting, blue or grey lips, new confusion, or chest pain that is intense or does not settle. Sudden breathlessness with coughing blood also needs urgent assessment. These symptoms can have several causes and should not be explained away by a previous diagnosis.

Which type or likely cause is being considered? Which tests will distinguish a heart, lung, clot-related, or blood-vessel cause? What activity limits or warning symptoms should I follow while testing is underway?