Background: Many children suffer from functional constipation. In case of functional constipation there is no underlying disease. In Sweden, functional constipation is very common in children. Risk factors include lack of physical activity, irregular toilet habits and insufficient intake of fibers and fluids. Child health nurse has the knowledge and skills to advise and treat children in functional constipation and to support and reduce the suffering. Aim: The aim of the study was to illuminate child health nurses' experiences in the care of children with functional constipation. Method: Ten child health nurses were interviewed during a semi structured interview used openended questions. The interviews were recorded as digital files and transcribed verbatim and then analyzed according to a qualitative content analysis. Results: The child health nurses described experiences in the care of children with functional constipation. There were two categories from the analyzed data: "to base on the child`s needs" and "the child´s physical and psychosocial environment". Conclusion: This study shows the child health nurses experiences in the care of children with functional constipation. The care is based on the childs neeeds and the environment around the child in terms of physical and psychosocial environment is taken into account. The child health nurses should be aware of the reason why parents seek care, how to find the cause of functional constipation and how to relieve the child's suffering. She creates a health promotion meeting with children and parents seeking care for functional constipation.