How cannabis receptors control your body's sweating

Researchers have discovered that cannabinoid receptors control sweating in a mouse model, revealing a previously unknown effect of cannabis on the body's cooling system. Using a novel measurement technique called galvanic skin response, the team found that the cannabinoid agonist CP55940 and the phytocannabinoid THC substantially reduced sweating activity, while CBD had no effect. Importantly, this reduction worked only through CB1 receptors—not CB2—suggesting a specific biological pathway. The study validates sweating as a legitimate target for cannabinoid intervention, paralleling how cannabinoids already regulate other glandular functions like tearing and salivation.

The researchers identified the cellular mechanisms behind this effect by mapping out a local endocannabinoid circuit in sweat glands. They found CB1 receptors positioned on nerve fibers controlling sweat glands, along with the enzymes that produce and break down anandamide (the body's natural cannabinoid). This anatomical arrangement suggests sweating is regulated by a sophisticated feedback system involving the endocannabinoid system. The study employed mouse paw pads, which contain eccrine sweat glands structurally similar to human sweat glands and respond to the same biological signals like temperature and muscarinic activation.

These findings have practical implications for cannabis users who may experience changes in their sweating patterns. For millions suffering from sweating disorders—including dangerous conditions like anhidrosis (inability to sweat)—this research opens doors to potential new treatments. Current therapies for excessive sweating or sweating deficiencies are limited and often ineffective, making cannabinoid-based approaches a promising avenue. The discovery that CB1 receptors specifically mediate this effect could eventually lead to targeted treatments that control sweating without other psychoactive effects.