03/06/2026
Why do concussion symptoms sometimes flare after you start feeling better?
The nervous system has a load tolerance. A limit for how much physical, cognitive, and sensory input it can handle while it is healing.
If that threshold is exceeded, symptoms like headaches, fatigue, or sensitivity can temporarily increase.
This doesn't mean that recovery has gone backwards.
It often means the system was asked to do slightly more than it was ready for that day.
Recovery is about gradually increasing that capacity over time.