A study of 37 participants has shown a build-up of the stress hormone cortisol can be measured from the oily secretions around your ear canal. Cortisol is known as your “fight or flight” hormone. When it sends out alarm signals to the brain in response to stress, it can influence almost every system in the body, from the immune system to digestion and sleep.

To read more about how your earwax test could reveal stress levels, Laraway Family Dentistry brings you this article from BBC News