Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pulmonary Hypertension ?
    ### Response:
    Pulmonary hypertension (PULL-mun-ary HI-per-TEN-shun), or PH, is increased pressure in the pulmonary arteries. These arteries carry blood from your heart to your lungs to pick up oxygen.
                
PH causes symptoms such as shortness of breath during routine activity (for example, climbing two flights of stairs), tiredness, chest pain, and a racing heartbeat.
    