Sand tree refers to cedar. Fir has the effects of activating blood circulation and relieving pain (relieving pain by removing blood stasis), removing dampness and dispersing toxins, expelling evils and obscenities, and lowering rebellious qi. It can be used to treat traumatic bleeding, bruises, swelling and pain, rheumatism and venomous sores, swollen feet, running dolphins, burns and so on. Fir is a plant of the genus Fir in the family Firaceae, and is mainly used as medicine for its roots, bark, leaves, cones, wood and fir joints. It has the efficacy of activating blood circulation and relieving pain, removing dampness and dispersing toxins, eliminating evils and filth, and lowering rebellious Qi. Fir can be used both internally and externally. For internal use, it can be decocted into soup; for external use, it can be decocted into water for fumigation or powdered and applied. Adverse effects are not clear, but it should be noted that cedarwood should not be used for a long time and overdose. And the virtual person is prohibited to take. The use of drugs should be carried out under the guidance of a professional physician, do not take medication without authorization, so as not to cause adverse consequences.