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Overview

What Is Pulmonary Hypertension?

Pulmonary hypertension is high blood pressure in the blood vessels that carry blood between the heart and lungs. This increased pulmonary artery pressure makes it harder for the heart to move blood through the lungs and can strain the right side of the heart. It may result from several heart, lung, blood-clot, or systemic conditions, and it can affect people of different ages. In other words, pulmonary hypertension is not one single disease but a condition with several possible causes.

Symptoms

Symptoms of Pulmonary Hypertension

  • Shortness of breath, especially during activity (dyspnea)
  • Unusual tiredness or reduced energy (fatigue)
  • Chest pain or pressure
  • Dizziness or feeling lightheaded
  • Fainting (syncope)
  • A fast, pounding, or irregular heartbeat (palpitations)
  • Swelling in the ankles, legs, or abdomen (edema)

Causes

Causes of Pulmonary Hypertension

Pulmonary hypertension develops when the pulmonary arteries become narrowed, stiff, blocked, or exposed to unusually high blood flow. These changes increase resistance in the lung circulation, so the right side of the heart must work harder to pump blood forward. Over time, this extra workload can weaken the right heart.

  • Left-sided heart disease can raise pressure backward into the blood vessels of the lungs.
  • Chronic lung disease or low oxygen levels can damage or narrow pulmonary blood vessels.
  • Chronic blood clots can remain lodged in pulmonary arteries and obstruct blood flow.
  • Pulmonary arterial hypertension is a disease of the small pulmonary arteries that may have an inherited, medication-related, or unexplained cause.
  • Other conditions, including connective-tissue disease or liver disease, can affect the pulmonary circulation.

Risk Factors

Risk Factors for Pulmonary Hypertension

  • A family history of pulmonary arterial hypertension or certain inherited gene variants
  • Congenital heart disease present from birth
  • Connective-tissue diseases such as scleroderma or lupus
  • Chronic lung disease, including chronic obstructive pulmonary disease
  • Sleep-disordered breathing, especially untreated sleep apnea
  • A previous pulmonary embolism or a blood-clotting disorder
  • Liver disease, including portal hypertension
  • HIV infection
  • Exposure to certain drugs, toxins, or appetite-suppressant medicines
  • Increasing age, particularly when combined with heart or lung disease

Complications

Complications of Pulmonary Hypertension

  • Right-sided heart failure caused by ongoing strain on the right ventricle
  • Abnormal heart rhythms (arrhythmias)
  • Blood clots in the pulmonary arteries or elsewhere in the body
  • Fluid retention causing swelling in the legs or abdomen
  • Low oxygen levels in the blood
  • Reduced exercise capacity and difficulty with everyday activities
  • Rarely, severe cardiopulmonary deterioration that can be life-threatening

MONITORING MATTERS

Complications can develop gradually

The risk of complications depends on the type, severity, and cause of pulmonary hypertension, as well as the response to treatment. Regular follow-up helps clinicians monitor pulmonary artery pressure, heart function, oxygen levels, and changes in symptoms.

Diagnosis

How Pulmonary Hypertension Is Diagnosed

Evaluation begins with a medical history, physical examination, and assessment of oxygen levels, along with tests that look for heart or lung disease. Symptoms alone cannot confirm pulmonary hypertension because breathlessness and fatigue have many possible causes. Clinicians use several tests to assess the pulmonary circulation, heart function, and likely underlying condition.

  • An echocardiogram uses ultrasound to estimate pressure and examine the size and function of the heart.
  • An electrocardiogram records the heart’s electrical activity and may show strain or an abnormal rhythm.
  • Chest imaging, such as an X-ray or CT scan, looks for lung disease, enlarged vessels, or blood clots.
  • Pulmonary function tests measure how well the lungs move air and oxygen.
  • Blood tests look for associated conditions, inflammation, organ problems, or other causes.
  • Sleep or oxygen testing checks for low oxygen levels during sleep or activity.
  • Right-heart catheterization directly measures pressures in the right heart and pulmonary arteries and may confirm the diagnosis when appropriate.

Treatment & Management

Pulmonary Hypertension Treatment and Management

Pulmonary hypertension treatment depends on its cause and clinical group. Treatment may aim to lower pulmonary artery pressure, improve symptoms and activity tolerance, protect the right side of the heart, and control the underlying condition. Long-term care often includes regular monitoring by clinicians familiar with pulmonary vascular disease.

  • Heart or lung disease is treated with medicines, procedures, and lifestyle measures suited to the underlying condition.
  • Anticoagulation may be prescribed when chronic blood clots or another clotting risk makes it appropriate.
  • Pulmonary arterial hypertension medications may relax pulmonary blood vessels or slow disease progression in selected patients.
  • Oxygen or diuretics may be prescribed to improve low oxygen levels or reduce fluid retention.
  • Supervised physical activity or pulmonary rehabilitation can support safe conditioning and daily function.
  • Procedures to remove chronic clots or improve blood flow may be considered for selected patients.
  • Advanced cases may require evaluation for lung or heart-lung transplantation.

TREATMENT MUST BE INDIVIDUALIZED

Medication choices depend on the cause

Do not start, stop, or change a pulmonary hypertension medication without speaking with the prescribing clinician. Medicines used for one type of pulmonary hypertension may be ineffective or unsafe for another type.

Outlook and Prognosis

Outlook and Prognosis

Some forms of pulmonary hypertension can improve when the underlying cause is treated, while pulmonary arterial hypertension and other chronic forms usually require lifelong monitoring and therapy. The outlook varies widely from person to person. Early evaluation and an individualized treatment plan can help manage symptoms and protect heart function.

  • The disease type and underlying cause strongly influence the expected course.
  • The severity of elevated pulmonary artery pressure and the extent of vessel changes affect outlook.
  • Right-heart function is an important indicator of how the condition is affecting circulation.
  • Functional capacity, including how much activity a person can tolerate, helps clinicians assess disease impact.
  • The response to treatment can influence symptoms, daily function, and long-term management.
  • Other medical conditions may add strain or affect which treatments are possible.
  • Access to specialist care and consistent follow-up can support timely treatment adjustments.

When Should You See a Doctor

When Should You See a Doctor?

ARRANGE MEDICAL EVALUATION

Do not ignore persistent or worsening symptoms

Arrange medical evaluation for unexplained or persistent shortness of breath, fatigue, chest discomfort, dizziness, fainting, palpitations, or swelling. Seek care promptly when symptoms limit activity or become worse over time, as these can be symptoms of pulmonary hypertension or another heart or lung problem.

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