A flair is considered a NEW or worsening old symptom that lasts for at least 24 hours. Even if its shin splits, or other such issues that cause pain. You then have 10 days to make up your mind if you wish steroid treatment or interventions to make it push towards getting better. After 10 days the rate of recovery is exactly the same as those who start steroids after 10 days as for those that took no steroids and simply allowed their body to recover with other interventions.

So, has this symptom been lasting for 24 hours? if so, it does warrent a call to the neuro. even if you choose no treatment, it will be kept as part of the records of how his MS is progressing or not progressing.