Transdiagnostic Online CBT vs. Care as Usual for Primary Care Patients With Subsyndromal Mental Ill-health ( PRIMARITA-2 )

Inclusion Criteria: To be included patients have to: 1. To be included patients have to: (a) have a subsyndromal mental health problem concerning anxiety, depressive symptoms, or stress-related ill-health that warrants treatment, 2. be at least 18 years old, 3. have regular access to a device with an Internet connection, 4. be able to read and write in Swedish, 5. have no severe psychiatric disorder that requires specialized psychiatric care, such as psychosis, bipolar disorder, or anorexia nervosa, 6. if on medication with monoamine agonist, have stable dosage in the past month, 7. have no on-going psychological treatment, and 8. provide written informed consent for participation and complete baseline assessment Exclusion criteria: As the targeted population in this trial is primary care patients with subsyndromal mental ill-health that do not have a manifest specific common mental disorder, patients will be excluded if they meet diagnostic criteria for an anxiety disorder (social phobia, panic disorder, agoraphobia, general anxiety disorder, or specific phobia), a health anxiety disorder (hypochondriasis or illness anxiety disorder), obsessive-compulsive disorder, depression (depression or dysthymia), or a stress-related disorder (exhaustion disorder, adjustment disorder, or post-traumatic stress disorder). Note that meeting diagnostic criteria for not otherwise specified disorders (e.g., anxiety not otherwise specified), mixed anxiety and depressive disorder, or disorders subsumed under "other" categories is not a reason for exclusion.