In 2011 Japan suffered a triple catastrophe: an earthquake and a tsunami, followed by a nuclear accident at the Fukushima Daiichi Nuclear Power Plant. As the lead UN agency for advice and assistance on public health, WHO shares the concerns of the affected populations in Japan and continues to monitor the health risk situation in Fukushima. Related public health risk assessments and recommendations have been issued by WHO. WHO Collaborating Center – Fukushima Medical University is conducting a Health Risk Management Survey of the people affected by the accident. Today’s remaining challenge in terms of managing health impact of the accident, is mitigation of the psychosocial impact of the disaster.