Why does pulmonary hypertension cause difficulty in breathing

Patient's question:

My uncle was carefully diagnosed with pulmonary hypertension last week. He has been receiving treatment accordingly, but today he felt a bit short of breath. Could you please explain why pulmonary hypertension causes shortness of breath?

Doctor's answer:

Pulmonary hypertension-induced shortness of breath is not caused by insufficient blood supply to the lungs, quite the opposite, it is caused by excessive blood supply; shortness of breath caused by chronic lung disease should first have shortness of breath, followed by pulmonary hypertension; it is also possible that left heart failure leads to secondary pulmonary hypertension. In cases of pulmonary congestion or pulmonary edema, shortness of breath becomes more severe, often making it impossible to lie flat. Therefore, it is important to pay attention to maintaining proper posture during daily life.

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