Flatline is a community term
Flatline is not a formal diagnosis. In no-PMO communities, it usually means a period of low libido, low motivation, emotional dullness, anxiety, or uncertainty after stopping a high-stimulation pattern.
Some people report it. Some do not. The timeline varies. Because the evidence is still developing, it is better to treat flatline as a possible recovery experience rather than a guaranteed stage.
Why it may happen
If PMO became a frequent stress escape, removing it can expose the stress that was being avoided. Boredom may feel sharper. Loneliness may become more obvious. Ordinary rewards may feel slower.
The brain and body also need time to relearn lower-stimulation rewards: exercise, sunlight, work, real connection, and deep rest.
How to handle it
Do not test yourself with explicit content to see whether you are still responsive. That turns uncertainty into a trigger.
Keep the basics boring and consistent: sleep, movement, food, hydration, social contact, and planned work. If low mood, anxiety, or sexual dysfunction feels severe or persistent, talk to a qualified professional.