After falling down and drinking Yunnan Baiyao chest up a big bag may be drug reaction, injury itself, etc. caused by. 1. drug reaction: Yunnan Baiyao contains ingredients such as the preparation of grasshopper, the main role is to expand local blood vessels, accelerate the edema subside, relieve pain and so on. If the patient’s injury is in the acute stage, there will be a rupture of small blood vessels and tissue edema and other manifestations, the use of Yunnan Baiyao led to the aggravation of the above symptoms, which may lead to a large bag in the chest. 2. Injury itself: if the patient himself is a fall injury in the chest, after the injury, the local small blood vessels will rupture, and the contents of the blood vessels will leak out into the tissue space, resulting in subcutaneous bruising; at the same time, the body starts the self-repairing system, resulting in the infiltration of local inflammatory factors, tissue edema and so on, and it may also be manifested as a symptom of the chest mass. If the chest mass persists, you should go to the hospital in time for treatment.