Heaviness vs. Fatigue

Heaviness and fatigue are often used interchangeably, but they describe different states.

Fatigue is primarily related to reduced capacity.
It reflects depletion, overuse, or insufficient rest.

Heaviness, by contrast, is a sensation of weight or density.
It may occur even when energy is intact and sleep has been adequate.

While fatigue improves with rest, heaviness often does not.
This distinction matters when describing what recovery actually feels like.