Power of tears is that we can't control them

From sad films, pain and break-ups to weddings, reunions and moving music, what is it inside us that starts them flowing?

- BY DR RAJ PERSAUD, CONSULTANT PSYCHIATRIST

WHY is the sight of tears so shocking? Crying may have a biological function, removing stress-inducing hormones. But psychologically, tears signify so much more especially in the public domain.

Margaret Thatcher's on leaving No10, and Paul Gascoigne's over his yellow card at the 1990 World Cup, are both famous moments.