Health anxiety is a prevalent, disabling disorder associated with extensive health care expenditures. The lack of easily accessible, evidence-based psychological treatment combined with delayed diagnostic recognition constitute barriers to receiving treatment. Aim 1. To develop an internet-delivered treatment program, based on 'Acceptance and Commitment Therapy' (ACT), for patients with health anxiety. 2. To test the feasibility and effectiveness of the treatment programme in a randomized, controlled trial, comparing the treatment with an active control condition. Methods 150 patients aged 18 years and older can self-refer through a web-page to apply for participation. Before inclusion patients will undergo a video-diagnostic interview. Patients are randomly assigned to 12 weeks of either, 1) active treatment: consisting of internet-based ACT (iACT) with 7 therapist-guided modules of self-help text, exercises, patient videos and audio-files, or 2) active control condition: consisting of an internet-based discussion forum (iFORUM) with 7 topics of discussion. All patients will complete self-report questionnaires at baseline, before randomization, at 4 and 8 weeks into treatment, after end of treatment, and at 6-month follow-up.
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Timeframe: At baseline (i.e. at self-referral), before randomisation (i.e. after clinical assessment and up to 6 weeks after baseline) and 1, 2, 3 and 9 months after randomisation