Multiple Sclerosis: Disease Courses, Modern Therapies and Relapses Explained

At a glance

What is it? A chronic, inflammatory disease of the central nervous system (brain, spinal cord, optic nerves).
Who does it affect? Often young adults between 20 and 40, women more often than men.
Disease courses Mostly relapsing (RRMS), more rarely progressive (SPMS, PPMS).
Treatment Relapses with corticosteroids, plus an ongoing immunotherapy. Especially effective when started early.
Important to know MS is treatable. The old image of an inevitable wheelchair is outdated.
ICD-10 G35 (multiple sclerosis)

What is multiple sclerosis?

Multiple sclerosis (MS for short) is a chronic disease of the central nervous system, that is of the brain, spinal cord and optic nerves. In MS, the body's own immune system turns against the protective sheath of the nerve fibres (the myelin layer) and against the fibres themselves. This disrupts nerve signals. Small areas of inflammation form in various places, which gives the disease its name: multiple (many) sclerosis (scarring).

MS is the most common chronic inflammatory disease of the nervous system in young adults. One important point up front: MS is treatable today. The options have improved greatly in recent years, and the long-term course is considerably better than the old, often fear-laden image of the disease.

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Symptoms

Because the areas of inflammation can lie in different places, MS is very individual. Which symptoms occur depends on which areas are affected. Common ones are:

  • vision problems, such as blurred vision or a loss of vision in one eye, often with pain on eye movements (an inflammation of the optic nerve). More on this: Vision problems.
  • abnormal sensations such as numbness, tingling or a furry feeling.
  • a weakness, often on one side of the body. More on this: One-sided weakness.
  • balance and coordination problems or dizziness. More on this: Balance problems.
  • a pronounced exhaustion (fatigue), which many experience as especially burdensome.
  • problems with the bladder.

These symptoms do not all occur together, and not every one of them means MS. Many of these symptoms have harmless causes.

The disease courses explained

MS does not run the same way in everyone. Several disease courses are distinguished, which matters for treatment:

  • Clinically isolated syndrome (CIS): a first event with symptoms that can point to MS but does not yet meet all the criteria.
  • Relapsing-remitting MS (RRMS): the most common form at the start. Symptoms occur in relapses and then recede fully or partly. Between relapses the condition is stable.
  • Secondary progressive MS (SPMS): after years, a relapsing MS can turn into a form in which the impairments slowly and steadily increase.
  • Primary progressive MS (PPMS): here the symptoms slowly increase from the start, without clearly distinguishable relapses. This form is rarer.

A modern view also asks whether the MS is currently inflammatory active (new relapses or new lesions on the MRI) or not. This influences which therapy makes sense.

Causes and risk factors

Why someone develops MS is not fully understood. It is an autoimmune disease in which several factors act together:

  • a genetic predisposition, although MS is only rarely directly inherited.
  • a past infection with the Epstein-Barr virus (the cause of glandular fever) appears to play an important role.
  • a lack of vitamin D and smoking are considered to be contributing factors.

Important: MS is not contagious, and no one is to blame for the disease.

Diagnosis: how is it determined?

The diagnosis is made by a neurologist. As there is no single test, several building blocks are brought together according to defined criteria:

  • the medical history and a neurological examination.
  • magnetic resonance imaging (MRI) of the brain and spinal cord, which makes the areas of inflammation visible.
  • an examination of the nerve fluid (lumbar puncture), which can show typical signs of inflammation.
  • measurements of nerve conduction (evoked potentials).

The aim is to show that the areas of inflammation are spread out in space and have occurred at different times, and to rule out other causes.

What is a relapse, and what helps?

A relapse means that new symptoms occur or existing ones clearly worsen, over more than 24 hours and without another cause such as a fever behind it. Relapses often recede fully or partly.

One point is often confused:

  • A true relapse is based on new inflammatory activity.
  • A pseudo-relapse, by contrast, arises for example with heat, a fever or an infection. Existing symptoms temporarily intensify without a new inflammation being present. With heat, this is called the Uhthoff phenomenon. As soon as the cause is gone, the condition improves again.

What helps during a relapse:

  • contact your neurology practice when you notice new or clearly intensified symptoms.
  • a pronounced relapse is usually treated with high-dose corticosteroids (methylprednisolone), often as an infusion over a few days. This shortens the relapse and can reduce residual deficits.
  • if a severe relapse does not respond sufficiently, there are further options such as plasma exchange.

A relapse is therefore not a reason to panic, but a reason to seek medical advice and act in a targeted way.

Modern immunotherapies explained

Besides treating acute relapses, there is the disease-modifying therapy, often called immunotherapy. It is used on an ongoing basis and has a clear aim: to make relapses less frequent, to prevent new areas of inflammation and to slow progression.

Today there are many different active substances. Simplified, they can be grouped by how strongly they act:

  • agents with a moderate effect, for example interferons, glatiramer acetate, teriflunomide or dimethyl fumarate.
  • highly effective agents, for example certain antibodies (such as ocrelizumab or ofatumumab), S1P modulators (such as fingolimod), natalizumab or cladribine.

They are used in quite different ways: as a tablet, as an injection under the skin or as an infusion at fixed intervals. Which agent fits is decided together with the neurology team, depending on the disease course, the disease activity and your life situation.

The core idea: early and effective The earlier an effective therapy begins, the better relapses and new damage can be prevented. This is one of the reasons why the outlook in MS has improved so clearly in recent years.
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Living well with MS

An MS diagnosis is a shock at first. It helps to know: most people with MS lead an active, self-determined life. The old image that MS inevitably leads to a wheelchair is outdated. Things that can favourably influence the course:

  • a consistent therapy started early.
  • regular exercise and sport, which are proven to do good.
  • not smoking.
  • a balanced vitamin D level, in consultation with the practice.
  • keeping an eye on relapses and symptoms and raising them early.
  • accepting support, for example through physiotherapy and occupational therapy, specialist MS practices, self-help groups and your own circle.

Mental health is part of this too. Low mood and exhaustion are common with MS and can be treated well. You do not have to cope with this alone.

When to see a doctor

See a doctor promptly, ideally a neurologist, when new neurological symptoms occur and last longer than a day, for example:

  • blurred vision or a loss of vision in one eye.
  • a new weakness, numbness or tingling, often on one side of the body.
  • new balance or coordination problems.
Do not wait it out, but do not panic either New neurological symptoms should be assessed promptly, ideally by a neurologist. This is usually not an emergency in the sense of the ambulance service, but also not something to sit out for long. If you already have a known MS, report new or intensified symptoms early so that a possible relapse can be treated.

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Frequently asked questions

MS cannot be fully cured so far. But it is treatable well: modern therapies can clearly reduce relapses, prevent new areas of inflammation and slow progression.

No. This old image is outdated. Most people with MS stay mobile and lead an active life, above all with an early, effective treatment.

New or clearly intensified symptoms over more than 24 hours, without another cause such as a fever. A true relapse is based on new inflammatory activity and often recedes fully or partly.

With a pseudo-relapse, existing symptoms intensify temporarily, for example through heat or a fever, without a new inflammation. With heat, this is called the Uhthoff phenomenon. As soon as the cause is gone, it improves again.

The most common at the start is the relapsing form (RRMS). After years, this can turn into a secondary progressive form. More rarely, MS progresses slowly from the start (primary progressive).

A pronounced relapse is usually treated with high-dose corticosteroids, often as an infusion over a few days. If a severe relapse does not respond sufficiently, there are further options such as plasma exchange.

It makes relapses less frequent, prevents new areas of inflammation and slows progression. The earlier an effective therapy begins, the better the long-term course tends to be.

MS is not contagious and is only rarely directly inherited. There is a certain clustering in families, but the risk for relatives overall remains low.

Related topics

Quellen

  1. DGN und KKNMS: S2k-Leitlinie „Diagnose und Therapie der Multiplen Sklerose, Neuromyelitis-optica-Spektrum-Erkrankungen und MOG-IgG-assoziierten Erkrankungen“ (AWMF 030-050, Living Guideline). register.awmf.org/de/leitlinien/detail/030-050
  2. KKNMS (Krankheitsbezogenes Kompetenznetz Multiple Sklerose): Qualitätshandbuch und Patienteninformationen. kompetenznetz-multiplesklerose.de
  3. Deutsche Multiple Sklerose Gesellschaft (DMSG): Informationen für Betroffene. dmsg.de
  4. Deutsche Hirnstiftung und DGN: Patientenleitlinie Multiple Sklerose. hirnstiftung.org
  5. IQWiG / gesundheitsinformation.de: Informationen zur Multiplen Sklerose. gesundheitsinformation.de
Important note: This article is for general information and does not replace medical advice, diagnosis or treatment. The diagnosis and treatment of MS belong in specialist (neurological) hands. With new symptoms or questions about your therapy, turn to your doctor. Last updated: June 2026.