Many people around the world, when they are under stress start to add to their worries and all this anxiety can cause gray hair to appear. But is there any truth in this statement?

In an interview with "Shape" magazine, Dr. Doris Day, board-certified dermatologist and associate professor at New York University, says aging occurs with age, but it is highly variable.

The reason for gray hair usually depends on genetics and aging, but many believe that there is a link between stress and gray hair, due to an increase in cortisol, otherwise known as a stress hormone.

The doctor says that when the cortisol level is high, it can affect and accelerate the aging of the glands. In other words, stress can actually speed up your hair graying.

Basically, hair works in cycles, so it grows, stays alive on the scalp, then falls out and finally starts a new cycle. The best thing to do when you first see gray hair is to leave it where it is. Pulling out white hair is not a good solution because there is a high probability that the hair will not grow back.

Instead of seeing the hair thinning, it's better to let time take its course on our skin and maybe use a dye at the hairdressers to mask the signs of age.