The main purpose of the study is to conduct an initial feasibility evaluation of the new Internet-based EAET treatment manual. We will include 50 patients with somatic symptom disorder to take part of the treatment for nine weeks through the Internet. A within-subject design will be used. Self-report measures of symptom level and mechanisms of change will be conducted weekly. Feedback on content, process and potential caveats will be collected using surveys and written evaluations from the participants at post-treatment. Linear mixed models will be used to investigate trajectories of change in symptoms and processes.

Inclusion Criteria:

• Age over 18 years
• A total score ≥10 on the PHQ-15
• A diagnosis of SSD according to the DSM-5, i.e ≥1 of the 3 of: disproportionate thoughts about the somatic symtom, persistently high level of anxiety, or excessive time and energy devoted in regard to symptoms or health concerns
• Symptom duration ≥6 months
• Written statement from a medical professional that states that a medical evaluation has been conducted.

Exclusion Criteria:

• Alcohol or substance addiction
• A diagnosis of a psychological condition that might require other treatment (e.g., psychosis, suicidality, etc)
• Other severe medical condition that might require other treatment
• Ongoing psychological intervention or psychotherapy that may interfere with the psychological treatment
• Ongoing medical treatment that may interfere with the psychological treatment