What causes shivering after a shower?

Vasodilation

- After exercising or taking a hot shower, skin blood vessels initially dilate to cool down the body.

- When you get out of the shower, this skin gets exposed to the much colder air in your bathroom.

- The blood vessels in the skin subsequently constrict to reduce heat loss and maintain core body heat.

- The rapid constriction of these superficial blood vessels sends signals to your brain that you're cold.

- Your brain then triggers shivering to warm up the body.