A new website has recently been set up to help teenagers with cancer.
Robert was 11 when he was diagnosed with the disease, and is a spokesperson for the new site.
He tells us his story.
"I found out I had acute lymphoblastic leukaemia, a type of cancer, about two years ago.
It made me feel very tired and I had to sleep a lot. My bones ached and I had a lot of pain at the base of my spine.
I was emotionally drained, and I kept asking "Why me?" and wondering what I had done to deserve this.
My friends were surprised and didn't know what to do - I'd always been lively and healthy.
My cancer made me grow up quickly - I spent most of my time in hospital with adult doctors and nurses, so in a weird way, I learned to communicate better, and could talk about my feelings.
But sometimes, the doctors couldn't answer my questions quick enough, and I didn't always understand what they were doing.
The Teen Info on Cancer site would have really helped me, as it lets you know what the doctors are doing, and you can see what is going to happen next.
If you're in the same situation as me, it could really be good for you.
I'm getting better now. It will still be a few years until I get the all clear, but things are looking good."
Robert, 13, Bristol
Find out more about cancer by clicking on the Click4tic link on the top right of this page.
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