What is a Chinese bladder?

A Chinese bladder is an ancient Chinese medical instrument used for acupuncture and moxibustion. It is made from a small animal's bladder, usually a pig's bladder, and is used to hold and apply heat to specific points on the body. The bladder is filled with hot water, herbs, or other substances and then applied to the skin, allowing the heat to penetrate deep into the body and promote healing. Chinese bladders are also used to treat a variety of ailments, including pain, inflammation, and stress.