Main functions: It can promote blood circulation, relieve swelling and pain. It can be used for injury, blood stasis, muscle pain, rheumatism pain. Yunnan Baiyouyao spray has analgesic effect and can increase the pain threshold of mice subjected to electrical stimulation. It is also anti-inflammatory and detumescent, which can inhibit swelling. Yunnan Baiyao aerosol can also stop bleeding, promote platelet aggregation, shrink blood vessels, shorten coagulation time.