Many of us have small habits that make us feel better, but we can also live without them. For example, we might think of something as "lucky" or have a routine that feels comforting.

But for people who experience obsessive-compulsive disorder (OCD), these behaviours are much more intense and disruptive and are fuelled by unwanted thoughts that don't go away.

Obsessive-compulsive disorder is not always easy to understand, but it's a real illness that causes difficulties in a person's life. Learn more here.