Which hand—the left or the right—contains the acupoint for inducing menstruation?

Generally speaking, there is no specific claim that acupoints for inducing menstruation are located only on the left or right hand; either hand can be used. The specific analysis is as follows:

Inducing menstruation can be done by stimulating acupoints on either the left or right hand. By massaging the "Zhiwu" point (制污穴), which is located at the midpoint of the first joint on the dorsal side of the thumb, menstrual flow can be promoted. Applying pressure to this point helps accelerate the circulation of qi and blood, effectively alleviating delayed menstruation caused by stagnation of qi and blood stasis, and also improves overall blood circulation. For patients experiencing rectal bleeding, massaging the Zhiwu point may help improve symptoms by promoting gastrointestinal motility and achieving a hemostatic effect. Menstrual induction refers to using certain methods to promote the onset of menstruation or regulate the menstrual cycle. Common clinical approaches include traditional Chinese medicine regulation, dietary adjustments, moderate exercise, and stress reduction. Patients should consult a doctor before choosing any method.

The appropriate method for inducing menstruation should be selected based on individual body constitution. Proper induction can effectively replenish blood and enhance blood circulation. However, excessive attempts to induce menstruation may produce adverse effects and negatively impact health.