The standard treatment for an MS flare-up is a short course of high-dose corticosteroids, typically given over three to five days. These don’t cure the underlying disease, but they shorten the duration of a relapse by reducing inflammation in the central nervous system. Beyond steroids, several other medical treatments and practical strategies can help you recover faster and manage symptoms while the flare runs its course.
First Step: True Relapse or Pseudo-Relapse?
Not every worsening of symptoms is an actual flare. A pseudo-relapse looks and feels like the real thing but is triggered by something temporary: heat, infection, stress, or overexertion. The difference matters because pseudo-relapses don’t involve new inflammatory damage and don’t need steroid treatment. They resolve once the trigger is removed.
Heat is the most common culprit. A rise in your body’s core temperature by as little as 0.25°F can produce symptoms. Hot weather, vigorous exercise, a hot bath, or a fever all qualify. The mechanism is straightforward: heat slows or blocks nerve impulse conduction along nerves that are already damaged by MS, so old symptoms reappear or worsen. If you cool down and symptoms improve within hours, you’re likely dealing with a pseudo-relapse rather than new inflammation.
Urinary tract infections, colds, and other infections are another frequent trigger. If your symptoms worsen alongside signs of illness, treating the infection often resolves the neurological symptoms. Your neurologist will typically rule out infection before starting relapse treatment.
High-Dose Corticosteroids
When a true relapse is confirmed, the go-to treatment is high-dose corticosteroids for three to five days. The goal is to calm the immune system’s attack on nerve tissue, reduce swelling, and speed recovery. Most people notice improvement within days to a couple of weeks, though full recovery from a relapse can take weeks or months.
For years, the standard was intravenous infusions given at an infusion center or hospital. But a landmark French trial (the COPOUSEP trial) compared high-dose oral steroids to intravenous steroids head-to-head and found no meaningful difference. In that study, 81% of the oral group and 80% of the intravenous group improved by at least one point on a disability scale. Recovery at six months and the rate of new relapses were also similar. The only notable difference was a slightly higher risk of insomnia with the oral version. This means your neurologist may offer you the option of taking pills at home rather than spending time at an infusion center, which can be a significant quality-of-life advantage during a flare.
Side effects from the short course are common but temporary. Expect possible insomnia, a metallic taste in your mouth, increased appetite, mood changes, elevated blood sugar, and a flushed face. These typically resolve within a few days of finishing treatment. Your doctor may sometimes prescribe a tapering course of oral steroids afterward, though the benefit of this taper is unclear.
When Steroids Don’t Work
Up to 25% of people still have significant disability after completing steroid treatment. If your symptoms haven’t improved, there are two main options your neurologist may consider.
Plasma exchange (also called plasmapheresis) filters your blood to remove the immune proteins that are attacking your nervous system. It works best when started within 14 days of symptom onset, particularly when MRI shows active inflammatory lesions. Studies show that 40% to 60% of patients who failed steroid treatment experience moderate to marked improvement with plasma exchange. The process involves several sessions, usually every other day, where blood is drawn, filtered, and returned to your body.
A hormone-based injection that stimulates your body’s own anti-inflammatory response is another alternative. It works through different pathways than standard steroids and has shown positive outcomes in patients where steroids previously failed. It also carries a lower risk of neuropsychiatric side effects (mood and behavior changes) compared to corticosteroids, making it a useful option for people who are sensitive to the mental health effects of steroids.
Managing Specific Symptoms During a Flare
A relapse can bring a wide range of symptoms depending on where the new inflammation occurs. While steroids address the underlying inflammation, you may need additional help with the symptoms themselves.
Nerve Pain
Neuropathic pain, the burning, stabbing, or electric-shock sensations that come with nerve damage, is one of the most disruptive flare symptoms. The first-line medications for this type of pain are anticonvulsants, which calm overactive nerve signals. These are typically started at low doses or at bedtime because drowsiness and dizziness are common early side effects. Effective doses are often higher than starting doses, so it can take some time to find the right level. If anticonvulsants alone aren’t enough, certain antidepressants that also modulate pain signaling can be added.
Vision Problems
Optic neuritis, inflammation of the nerve connecting the eye to the brain, is a common flare symptom. It typically causes pain with eye movement and blurred or dimmed vision in one eye. Treatment depends on severity. If your vision has dropped below a certain threshold, or if you already have vision problems in the other eye, steroids followed by a gradual taper are generally recommended. Milder cases may be monitored without treatment, though your doctor may still treat if you have significant pain, specific blind spots, or a job that demands precise vision.
Fatigue
Fatigue during a flare is different from ordinary tiredness. It’s a heavy, whole-body exhaustion that rest doesn’t fully relieve. While there’s no single medication that eliminates it, pacing your activity throughout the day helps. Break tasks into smaller chunks, prioritize what matters most, and allow yourself to rest without guilt. Cooling strategies (cool vests, air conditioning, cold drinks) can also help if heat sensitivity is compounding your fatigue.
Rehabilitation During and After a Flare
Rehabilitation is considered an integral part of relapse management, not an afterthought. A multidisciplinary approach that includes physical therapy, occupational therapy, and sometimes speech therapy helps you recover function more completely. Physical therapy focuses on restoring strength, balance, and mobility. Occupational therapy helps you adapt daily tasks (dressing, cooking, working) to your current level of function. If a flare affects your speech or swallowing, a speech therapist can work on those specific skills.
Psychological support also plays a role. Flare-ups are emotionally taxing, especially when they bring new disability or disrupt your routine. Working with a psychologist or counselor who understands MS can help you manage the anxiety and frustration that come with unpredictable relapses.
What You Can Do at Home
Beyond medical treatment, several practical strategies can support your recovery and reduce the burden of a flare:
- Rest strategically. Your body needs more rest during a relapse, but complete bed rest can lead to deconditioning. Alternate periods of activity with periods of rest.
- Stay cool. Keep your environment cool, use cooling products, and avoid hot baths or prolonged sun exposure. Even small increases in body temperature can amplify symptoms.
- Simplify your schedule. Cancel or delegate what you can. Relapses are temporary, and pushing through can slow recovery.
- Eat well and stay hydrated. Steroids can increase appetite and blood sugar, so sticking to balanced meals helps you feel more stable during treatment.
- Track your symptoms. Keeping a brief daily log of what’s better, worse, or new helps your neurologist make treatment decisions, especially if the initial round of steroids doesn’t fully work and you need to discuss next steps.
How Long Recovery Takes
Most MS relapses improve over weeks to months. Steroid treatment shortens the acute phase, but the full recovery timeline varies widely depending on the severity of the flare and where the inflammation occurred. Some people recover completely. Others are left with residual symptoms that may or may not improve over the following months. Starting treatment early, ideally within days of symptom onset, gives you the best chance of a full recovery. The same principle applies to plasma exchange if steroids fail: the greatest benefit is seen when it’s initiated within two weeks of the flare starting.