Existential OCD fixes on questions about the nature of reality: whether anything exists, whether other people are conscious, whether you’re conscious, whether life has meaning, what happens after death, whether the universe is a simulation, why there’s something rather than nothing.
What makes this subtype distinctive is that the questions are legitimate. Philosophers have worked on them for millennia without resolution. So the sufferer is in the position of demanding certainty about something that has never yielded any, and every attempt to think it through produces more branches.
What it feels like
Frequently accompanied by depersonalisation and derealisation — a sense that you aren’t quite real, or that the world is flat, filmic, at one remove. That feeling is terrifying and it’s a well-documented anxiety response rather than a sign of losing your mind or of developing psychosis.
The compulsions are almost entirely mental:ruminating for hours, reading philosophy in search of a resolution, watching videos, arguing yourself into and out of positions, asking whether other people also think about this, researching derealisation to check whether it means something worse. Also grounding rituals: touching things to prove they’re real, checking your own reflection.
Why it isn’t psychosis, and why it isn’t depth
Two mistakes get made about this subtype in opposite directions.
Clinicians unfamiliar with it sometimes hear reality doubt and think psychosis. The distinguishing feature is insight: people with existential OCD know their questions are unanswerable and are distressed precisely because they can’t stop asking. They aren’t holding a fixed false belief; they’re trapped in an open one.
In the other direction, people sometimes flatter the theme as philosophical seriousness. It isn’t. The tell is that no answer helps. A genuine philosophical interest can sit with an open question and find it interesting. This can’t sit with it at all.
Treatment
ERP, which won’t resolve the question and isn’t trying to. The exposures involve deliberately holding the possibility — that nothing is real, that there’s no meaning, that you can’t know — and then not thinking about it. Not resolving it, not reading about it, not arguing with it, not grounding.
Scripts are used heavily here, precisely because they leave no room for the mental counter-argument.
ACT often pairs unusually well with this theme, because it’s explicitly about living according to what matters while unanswerable questions remain open — which is the exact skill this subtype requires.
A note about reading
If you’ve this theme, be careful with how you use pages like this one. Reading a good explanation once is education. Reading it repeatedly to make a feeling subside is a compulsion, and the fact that the material is intelligent doesn’t change what the reading is doing.