The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
Because it is a herb specifically indicated to treat postoperative pain as can be seen on Patrinia 's page.
Patrinia is a Cold herb that tastes Bitter and Pungent. It targets the Stomach, the Large intestine and the Liver.
Its main actions are: Expels Toxic-Heat, drains pus and clear Phlegm and abscesses. Invigorate Blood and relieves pain caused by Blood Stagnation. Reduces inflammation.
Sores Abscesses Carbuncles Postpartum pain Intestinal abscess Furuncles Erysipelas