This guideline is an update of NICEs previous guidance on generalised anxiety disorder (GAD). It reviews the evidence for low- and high-intensity psychological interventions and drug treatments, and also gives an insight into the experience of care of people with GAD, which is a common mental health problem and often co-occurs with other anxiety and depressive disorders. RCPsych Publications is the publishing arm of the Royal College of Psychiatrists (based in London, United Kingdom), which has been promoting excellence in mental health care since 1841. Produced by the same editorial team who publish The British Journal of Psychiatry, they sell books for both psychiatrists and other mental health professionals; and also many written for the general public. Their popular series include the College Seminars Series, the NICE mental health guidelines and the Books Beyond Words series for people with intellectual disabilities.