The symptoms of hemoptysis in pneumonia are not uncommon, and there are three main causes: 1. capillary rupture in the lung, which is the most common condition. This is a relatively rare condition, but once it occurs, it is dangerous because of the risk of death by asphyxiation and requires active hemostatic treatment, including the use of vasoactive drugs such as posterior pituitary hormone and phentolamine. can cause the symptoms of hemoptysis.