Siler (also known as Fang Feng or Saposhnikovia divaricata) is an herb widely used in traditional Chinese medicine (TCM). Its application for afterbirth pain is rooted in TCM theory rather than modern scientific validation. In TCM, afterbirth pain is believed to be associated with the presence of "wind," "cold," or "dampness" in the body following childbirth, leading to stagnation and pain. Siler is thought to "expel wind" and alleviate pain and spasms, and thus it may be included in herbal prescriptions intended to support postpartum recovery and address afterbirth discomfort.

Historical TCM texts, such as the Shennong Bencao Jing and various materia medica, mention Siler as an ingredient that can dispel wind and relieve pain, though its most common uses are for conditions like headaches, body aches, and rheumatism. There is limited direct documentation of Siler being used solely for afterbirth pain, but it may appear in complex formulas prescribed for postpartum women, where it is combined with other herbs thought to address the unique needs of the postpartum period.

Modern scientific research on Siler focuses mainly on its anti-inflammatory and immunomodulatory properties, not specifically on afterbirth pain. Thus, its use for this indication remains primarily supported by tradition, with little to no high-quality clinical evidence available.