What Causes It?
Blood clots in lung arteries (pulmonary embolism)
High blood pressure in lung arteries (pulmonary arterial hypertension)
Chronic lung diseases (COPD, interstitial lung disease)
Congenital heart defects
Connective tissue diseases (scleroderma, lupus)
Left heart disease causing back pressure on lung vessels
Infections affecting the lung vasculature
Genetic mutations affecting vascular structure
Signs & Symptoms
Shortness of breath (especially during exertion)
Fatigue and weakness
Chest pain or pressure
Swelling in ankles, legs, or abdomen (edema)
Dizziness or fainting (syncope)
Cyanosis (bluish lips or skin due to low oxygen)
Rapid heartbeat (palpitations)