To regress.......

[sondra]

Hello,

Could you tell me if the word 'Regress' always refers to one's behaviour?
I came across this sentence and decided to make sure if it does.

After a period of some weeks without treatment, the rash and any other manifestations of secondary syphilis will regress and the disease enters the early latent stage.

Thanks

[SoothingDave]

Anything that can progress can also regress.