You want to avoid anything that causes a return or increase in symptoms. Healing happens best when you are at minimal symptoms. Getting good rest, nutrition, and avoiding relapse triggers such as bumps etc. Getting drunk is also a serious relapse trigger and well as staying out late and getting physically and mentally exhausted.

As the old adage goes: Doc, I always end up feeling lousy after I do such and such. Doctor responds, Stop doing such and such.

It is not brain surgery to understand the cause and effect of PCS and our triggers. It just takes a bit of afterthought in the beginning and forethought later as we learn to take better care of ourselves.

btw, a serious relapse of symptoms or increase in symptoms may indicate that you have injured your brain further.