A teenager from West Sussex is speaking out about ovarian cancer after being diagnosed at just 12 years old.
Olivia Parslow from Bognor Regis is one of the youngest people in the world to suffer from the disease.
It normally affects women older than 50.
She visited the doctor after she put on three stone in just three weeks.
Olivia had surgery on her ovary to remove 15 litres of fluid.
She then had four rounds of chemotherapy.
Olivia Parslow, cancer patient
Ovarian cancer is the sixth most common cancer among women.
Russ and Beki Parslow, Olivia's parents
Olivia is now in remission and has check ups every three months.
Her blond hair has grown back black and curly.