10/21/2026
The first cold, wet week of autumn tends to bring the same patients back: the knee that aches before rain, the low back that stiffens overnight and loosens by noon.
In Chinese medicine this picture is called wind-damp obstruction, and Du Huo (Angelica pubescens) is one of the classic herbs for it. Its traditional use leans toward the lower half of the body. That is why it leads the formula Du Huo Ji Sheng Tang, alongside Eucommia and Loranthus, for long-standing low back and knee complaints in older patients.
The root is rich in coumarins such as osthole, which appear to quiet inflammatory signalling in joint tissue. That fits the traditional picture well: pain that is dull, heavy and worse in the cold.
Du Huo is warm and drying, so it suits the stiff, cold, damp joint far better than one that is hot, red and swollen. Many practitioners pair it with Eucommia when the back feels weak as well as sore.
Cautions: avoid in pregnancy, use care in dry or depleted patients, and keep in mind that its coumarins may increase sun sensitivity in some people.
Do you reach for Du Huo on its own, or mostly within the classic formula?