Yuan Hu has the effects of invigorating blood circulation, promoting circulation of Qi and relieving pain. The active ingredients precipitated from Yuan Hu in water are limited and it is recommended to take it by decoction. It should be contraindicated for pregnant women, and should not be taken as a single medicine for those with Qi deficiency, blood deficiency and deficiency of both Qi and blood. Yuan Hu is the dried tuber of Yan Hu Suo, a plant of the poppy family, which is pungent, bitter and warm in nature, and has the efficacy of invigorating blood circulation, promoting qi circulation and relieving pain. It can be used for the treatment of qi stagnation and blood stasis (due to blood stagnation caused by the lack of qi) caused by thoracic and hypochondriacal (chest and ribs), epigastric (gastro-epigastric and abdominal) pain, thoracic paralysis (chest tightness and pain), cardiac pain, menstrual cramps and pain in bruises, etc. It should be noted that pregnant women should not use it for the treatment of pain in the chest, as well as the treatment of pain in the abdomen. It should be noted that Yuan Hu is contraindicated in pregnant women; it should not be taken in large quantities as a single medicine for those with deficiency of qi, blood and qi/blood, those with wind-heat sensation, yin deficiency (deficiency of yin and essence in the body, which leads to hyperactivity of deficiency and fire), and blood deficiency and blood-heat, etc. It should be used with caution for those who have menstrual periods and those who suffer from blood deficiency without blood stasis. It is recommended to take Yuan Hu under the guidance of a doctor in order to avoid misunderstanding or adverse reactions.