Girls born in 2004-2007 (9-12 years) as of pediatricians receive or have received the diagnosis functional abdominal pain or IBS according to the ROME III criteria and stating that they have persist symptoms for at least 2 months after completed investigation from pediatricians. Persistent symptoms are measured by pain diary at baseline and means that the girl at least once in the pain diary estimates 4 or higher as measured by the Faces Pain Scale (FPS-R).