Cannabis contains compounds called cannabinoids, such as tetrahydrocannabinol (THC) and cannabidiol (CBD), which have been shown to have pain-relieving properties.

THC is the primary psychoactive compound in cannabis, and it can activate the body's cannabinoid receptors, which are found in the brain and throughout the body. When these receptors are activated, they can reduce pain perception, inflammation, and promote relaxation.

CBD, on the other hand, does not produce a psychoactive effect but has been shown to have anti-inflammatory and analgesic properties. CBD may also enhance the pain-relieving effects of THC when they are used together.

Cannabis can be used to treat chronic pain, neuropathic pain, and pain associated with conditions such as multiple sclerosis, arthritis, and cancer. It can be consumed in a variety of ways, including smoking, vaporizing, edibles, oils, and topical creams.