If you do not have any new symptoms, and the old symptoms are not worse, you are considered to be in remission.

Your old symptoms, or residual symptoms left from previous exacerbations, can come and go. They do not have to be a constant all the time thing.

Most of mine are intermittent that way. Some days it is non-stop and others not at all. As long as whatever symptom appears is the same level of severity as it was previously, it is a part of your new normal.

If these things are come and go for you but suddenly stay for more than a day or so, you might be in a flare. Same for if it comes but is a lot worse than it usually is.

It is confusing, most consider remission to be back to normal. I did too, then thought WTF?!?

Unfortunately, MS remission only means the disease is not actively causing damage. We are still stuck with the permanent damage from previous relapses.