Primary Progressive MS (PPMS)

What is Primary Progressive Multiple Sclerosis (PPMS)?

This type of MS is called Primary Progressive Multiple Sclerosis (PPMS) because it is progressive from the first (primary) symptom, as opposed to experiencing relapses. 

Approximately 10-15% of people with multiple sclerosis are diagnosed with Primary Progressive MS (PPMS). This type of MS commonly affects middle-aged men, although it can affect women and other age groups too. Although the symptoms get gradually worse, there can be no obvious changes for long periods of time. During these times, the symptoms seem to be stable.

• Equal numbers of men and women have PPMS, whereas more women than men are diagnosed with relapsing remitting MS (RRMS).
• If you are diagnosed with PPMS you can experience many of the same symptoms as those with RRMS. 
• PPMS is often diagnosed in people in their 40s or 50s, but it can be diagnosed earlier or later than this. 

The biology of Primary Progressive Multiple Sclerosis (PPMS)

Unlike relapsing-remitting MS, PPMS involves less overt inflammation and more diffuse damage to the central nervous system, particularly in the spinal cord and deep grey matter. Neurodegeneration – rather than inflammation – is the primary driver of progression in PPMS. Chronic activation of microglia, mitochondrial dysfunction, and oxidative stress contribute to sustained axonal damage. MRI findings in PPMS typically show fewer active lesions but more extensive atrophy, especially in the spinal cord and brain.

Key mechanisms include:

• Chronic microglial activation causing a toxic environment for neurons
• Mitochondrial dysfunction and oxidative stress leading to energy failure in axons
• Iron accumulation worsening oxidative injury
• Cortical demyelination and meningeal inflammation, sometimes involving B-cell follicle-like structures
• Axonal loss that progresses even in the absence of visible inflammation

These processes help explain why PPMS tends to respond poorly to conventional anti-inflammatory treatments. Future research is focused on neuroprotective strategies, remyelination, and metabolic support to address the underlying biology of progression.

How is Primary Progressive MS (PPMS) Diagnosed?

Primary Progressive Multiple Sclerosis (PPMS) is diagnosed through a combination of clinical evaluation, imaging studies, and tests to rule out other conditions. Because PPMS progresses gradually from the onset without distinct relapses or remissions, the diagnostic process is slightly different from relapsing forms of MS. Here’s how it is typically diagnosed:

1. Clinical History and Neurological Examination
   A neurologist takes a detailed medical history and performs a neurological exam to assess signs of progressive neurological decline. In PPMS, symptoms usually include gradual worsening of motor function, especially walking and leg strength, over at least one year.

2. MRI (Magnetic Resonance Imaging)
   MRI of the brain and spinal cord is used to detect lesions typical of MS. PPMS often shows; Spinal cord lesions (more prominent than brain lesions) and fewer or no brain lesions compared to relapsing forms.

3. Lumbar Puncture (Spinal Tap)
   Cerebrospinal fluid is tested for oligoclonal bands, which are markers of chronic inflammation in the central nervous system and support the diagnosis of MS.

4. Evoked Potentials
   These tests measure electrical activity in response to stimuli to detect slower nerve signal conduction, which can be affected by demyelination.

5. Exclusion of Other Conditions
   Other neurological disorders (e.g., spinal cord compression, infections, vitamin deficiencies, autoimmune diseases) must be ruled out.

Active Primary Progressive Multiple Sclerosis (PPMS) Diagnosis

Sometimes in PPMS there is evidence of ongoing inflammatory activity, despite the overall progressive nature of the disease. This activity can be seen on MRI as new or enlarging T2 lesions and/or through clinical relapses (which are rare but possible in PPMS). While the hallmark of PPMS is gradual progression due to neurodegeneration, the presence of inflammatory activity in active PPMS suggests an overlap between degenerative and inflammatory processes. Identifying this activity is clinically important, as it may influence treatment decisions and eligibility for certain disease-modifying therapies.

Features of Active PPMS may include:

• New or enlarging T2 lesions on MRI
• Gadolinium-enhancing lesions, indicating ongoing inflammation
• Occasional relapses or acute worsening of symptoms
• Greater potential responsiveness to anti-inflammatory treatments (e.g ocrelizumab)
• Higher likelihood of earlier disease progression if not treated

While neurodegeneration remains a central feature of all PPMS, those with active disease are thought to have more inflammation-driven damage, particularly in the early years, making timely diagnosis and intervention essential to slow progression.

Primary Progressive Multiple Sclerosis (PPMS) Symptoms

There can be considerable variation regarding the progression of symptoms with PPMS. For example, one study found that a quarter of people with PPMS needed a cane by 7.3 years after receiving a diagnosis; in contrast, a quarter still didn’t need one at 25 years.

Symptoms differ between person to person with PPMS.  PPMS is unpredictable because it depends where damage occurs. 

The most common symptoms someone who is diagnosed with Primary Progressive Multiple Sclerosis (PPMS) may experience include:

• Problems with memory and focusing
• Vision problems
• Bladder spasms or bowel problems
• Muscle spasms or weakness
• Fatigue
• Numbness and tingling
• Sexual problems
• Difficulty walking
• Pain
• Depression

Primary Progressive Multiple Sclerosis (PPMS) Treatments

Although PPMS is a progressive form of multiple sclerosis, effective management can make a real difference. Many people experience long periods when their symptoms remain stable. By combining medical care with self-management, you can take an active role in maintaining your health and improving your quality of life.

Managing PPMS involves a comprehensive approach aimed at slowing disease progression, easing symptoms, preserving function, and enhancing daily wellbeing.

Your healthcare professional will help you explore treatment options — including Disease Modifying Therapies (DMTs) — which may slow disease progression, particularly when started early after diagnosis. Treatment plans are highly individual and depend on several factors such as:

• The availability of specific drugs in your region
• The symptoms that most affect you
• Other existing health conditions or relevant family history
• Potential side effects and how you tolerate treatment

In addition to medical treatment, targeted symptom management can help control challenges such as spasticity, pain, fatigue, and bladder issues.

Equally important is adopting a positive lifestyle approach to help you live well with MS.

Self-Management Strategies for Primary Progressive Multiple Sclerosis (PPMS)

The Overcoming MS Program has proved to be successful in combating the effects of Primary Progressive Multiple Sclerosis (PPMS) through targeting improvements to key lifestyle pillars:

• Diet
• Sunlight & Vitamin D
• Exercise & Physical Activity
• Stress Management & Meditation
• Medication
• Family Health
• Change Your Life, For Life

This combination of lifestyle changes can provide tangible mental and physical health benefits over the long-term to help you live well with MS. These pillars reflect practical lifestyle choices that can have a big impact, including:

• Staying physically active: Gentle, regular exercise (such as walking, swimming, yoga, or stretching) can help maintain strength, balance, and flexibility.
• Managing fatigue: Prioritise rest, plan activities, and use energy-saving techniques throughout your day.
• Eating well: Follow a balanced diet rich in fruits, vegetables, whole grains, and lean proteins to support overall health and manage weight.
• Keeping your mind active: Engage in mentally stimulating activities and, if needed, seek support for memory or concentration challenges.
• Protecting emotional wellbeing: Talk openly about how you feel, connect with support groups, and consider counselling if you’re struggling.
• Maintaining social connections: Staying connected to friends, family, or community activities can boost resilience and mood.
• Monitoring symptoms: Keep track of changes and communicate them to your healthcare team for early intervention.
• Avoiding smoking and limiting alcohol: Both can have a negative impact on MS progression and overall health.

Living with Primary Progressive Multiple Sclerosis (PPMS)

Living with Primary Progressive MS can be challenging, but it’s absolutely possible to lead a fulfilling and meaningful life. While PPMS may change how you do certain things, it doesn’t define who you are or what you can achieve. The key is finding ways to adapt, prioritise what matters most to you, and seek support when you need it.

Here are some ways to help you live well with PPMS:

• Listen to your body: Some days will be easier than others. Pace yourself, take breaks when needed, and don’t feel guilty about resting.
• Stay connected: Surround yourself with people who understand and support you. Consider using the Live Well Hub to talk to others with MS
• Work with your healthcare team: Regular reviews help keep your treatment and symptom management plans up to date and tailored to your needs.
• Use tools and adaptations: Simple aids, home adjustments, or workplace adaptations can help you stay active, independent, and confident.
• Focus on what you can control: Set small, achievable goals that help you stay motivated and positive.
• Look after your mental wellbeing: It’s normal to feel low or frustrated at times. Reach out for emotional support or counselling if you need it.
• Celebrate progress: Acknowledge the things you manage each day, however small they may seem. Every step counts.