Symptoms of PAH, which has no known cause, include shortness of breath following exercise, excessive fatigue, weakness, dizziness and fainting. The symptoms tend to grow worse over time.

• 发病因素尚未知，其主要症状包括：在运动后的呼吸急促，过度疲劳，虚弱，头晕和晕厥。这些症状随时间流逝而有加剧。