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The following are some known causes of pulmonary hypertension: 1  The diet drug fen-phen.. Although the appetite suppressant fen-phen (dexfenfluramine and phentermine) has been taken off the market, former fen-phen users have a 23-fold increase risk of developing pulmonary hypertension, possibly years later.
With pulmonary hypertension, the rise in blood pressure is caused by changes in the cells that line your pulmonary arteries. These changes can cause the walls of the arteries to become stiff and thick, and extra tissue may form. The blood vessels may also become inflamed and tight.