Here is my list of what I call "residual symptoms" that I experience daily. These are not "new", but have been with me for years. Some of them "get worse" sometimes...intensify...but that's not an "exacerbation", it's still "residual symptoms":
Spasticity of limbs, particularly my legs. "Big toe" constantly curves up (on both feet); ankles twist, knees flex "back", making standing impossible. Spasticity in calves sometimes is more pronounced, sometimes less so. Spasticity in thighs is moderate. Spasticity in groin is constant, and annoying. :) Spasticity around my torso is pretty mild right now (sometimes called the "MS hug") but worsens when I get over-tired, or in summer if I get over-heated.
Numbness and tingling from mid-torso to toes. This also worsens when I'm fatigued, or too hot.
Weakness in my arms, particularly right arm and hand. I can only hold a pencil (or small tool ) briefly. I always have to watch to be sure I'm holding something (for example, if I pick up a cup of coffee, I have to be sure to watch that I keep holding it, or my hand will "let go" on it's own). This is challenging, as I'm right-handed. I tell people I can write long enough to sign checks and credit cards...a dangerous thing! :)
If I weren't taking oxybutanin twice a day, I'd not have bladder control. If I didn't use glycerin suppositories once every couple of days, I'd not have bowel control. Even with those things, bladder and bowel control is "questionable". I have had loss of both at times.
Esophageal spasms. I don't get these daily...but maybe a couple times a week. Note that this is a "residual symptom" -- just because it doesn't occur daily, doesn't make it a "new exacerbation". That distinction is true for all of these symptoms! Anyway .. the spasms mean that I'll start to burp/burp/burp and if I can't swallow water sufficiently to "bump open" the spasm, I'll vomit. (I make a great lunch companion!! :) )
Fatigue. Not "pass out or fall asleep" fatigue ...but more an overwhelming sense of "I need to lie down right now", can't deal with another activity, must leave the room and be by myself fatigue. Again, this doesn't happen daily, but is still a "residual" symptom.
"Remission" in the early stages of MS may in fact mean you'll go for some periods of time without any of these symptoms occuring. But not always. If you've had a major exacerbation which has damaged your nervous system sufficiently, you'll have these sorts of things to deal with always. That's not a new exacerbation. Like, every time I get constipated, that's not an exacerbation -- it's my mismanagement of my "bowel program". Every time I experience the "MS hug", that's not an exacerbation; it's that I've gotten overtired, or overheated, or am sick with something else, causing that symptom to worsen. Every time I have an esophageal spasm it's not an exacerbation; it's another example of spasticity affecting my body. And so on. Do you see the differences?
...I am not a doctor, nor health professional, and don't pretend to be one, here.....