Some embodiments of the invention relate to a method of treating pulmonary hypertension comprising: introducing a catheter device comprising one or more energy emitting transceivers into the pulmonary artery lumen; positioning the one or more transceivers within the left, right and/or main pulmonary artery at a location which is in between the first bifurcation of the left pulmonary artery and the first bifurcation of the right pulmonary artery; and thermally damaging nerve tissue by emitting energy having parameters selected to damage nerves only within a distance window of between 0.2 mm and 20 mm from the intimal aspect of the pulmonary artery wall when the one or more transceivers are positioned at the selected location.