Keeping secrets may be damaging to health because the internal torment drives up stress, causing sleeping problems, wrinkles and sickness.
According to scientists, 95 percent of people keep an average of 13 secrets at a time. The experts at Columbia University in New York said the amount of time thinking about the secret is more harmful to health than the secret.
Researchers said one of the most frequently kept secrets were sexual fantasies about a non-partner or having sexual relations with a non-partner.
Other commonly held secrets were sexual orientation, poor self-image, finances, poor job performance, health challenges and addiction.
These undisclosed thoughts can cause stress hormones, such as cortisol, to go wild. High cortisol can lead to high blood pressure and weak immune system.
Secrets may also impact the way we relate to others, people who have
secrets tend to change their language and behavior when communicating with their friends.
Secret-keepers are socially active and very vigilant than usual, they respond quickly to those they were keeping in dark.