When symptoms suddenly get worse, the first question is always: is this a real relapse or is this something temporary? The distinction changes the medical interpretation — a relapse may involve new inflammation, while a pseudo-exacerbation from heat or illness usually settles as the trigger improves. These terms give you the vocabulary to describe what you are feeling and to understand what clinicians are weighing.
4 terms in this topic
Relapse
A relapse, also called an exacerbation or flare, is a new symptom or a clear worsening of an old symptom that lasts at least 24 hours and is not caused by something like heat or il...
Pseudo-exacerbation
A pseudo-exacerbation is a temporary return or worsening of old MS symptoms caused by something other than new nerve damage. Common triggers include heat, infection, stress, poor s...
Optic Neuritis
Optic neuritis is inflammation of the nerve that carries signals from the eye to the brain. It often causes blurry vision, a dim or washed-out look in one eye, pain with eye moveme...
Steroid Treatment
Steroid treatment uses high doses of corticosteroids, often methylprednisolone, to calm down the inflammation during an MS relapse. It can be given by IV or as pills over a few day...
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Reviewed by the MS Buddy editorial team. Not medical advice — always consult your care team.