The most common reason people with the most severe anxiety delay getting help is a version of this: my anxiety is too bad for online therapy to work. I need something more serious. This belief is, for the vast majority of people who hold it, generated by the anxiety itself. It is the anxiety providing a reason not to treat the anxiety. Here is what the evidence shows, and the honest assessment of when online therapy is exactly right for severe anxiety and when it needs to be combined with additional support.
The critical point: the right column is not "online therapy does not work." It is "online therapy may need to be combined with additional support." For all the presentations in the right column, CBT remains one of the most important treatment components. The question is whether weekly online CBT sessions are sufficient as the sole support, not whether CBT is appropriate at all.
For most people who believe their anxiety is "too severe" for online therapy, the presentation is in the left column. The belief that the severity disqualifies them is a feature of the anxiety itself: catastrophising about the severity, believing that help will not work, and avoiding seeking support are all recognised features of significant anxiety disorders.
The Anxiety and Depression Association of America recommends CBT as a primary treatment across all severity levels of anxiety disorders. The severity of the presentation is not a contraindication to CBT; it is the primary indicator for it. More severe presentations typically benefit from a full 16-session course rather than shorter programmes, and may benefit from concurrent medical assessment for medication options, but the CBT component remains central regardless of severity.
For some severe anxiety presentations, online CBT works most effectively when combined with medication prescribed by a GP or psychiatrist. Medication, typically SSRIs for anxiety disorders, does not treat anxiety through the same mechanism as CBT. It reduces the physiological activation that makes the cognitive work harder to engage with, which can make the CBT more effective. Medication and CBT in combination typically produce better outcomes than either alone for severe presentations.
If your anxiety is at a level that is significantly affecting daily functioning and you have not discussed medication with a doctor, that conversation is worth having alongside starting CBT. The two approaches are complementary. Starting online CBT does not preclude also speaking to a GP about medication options. Both interventions target different components of the same system.
If the anxiety is accompanied by significant low mood, persistent hopelessness, or thoughts of self-harm, a GP assessment is appropriate as the first step. Online CBT remains appropriate alongside that assessment but is not a substitute for it in these circumstances.