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Risk of developing MS
In the general population in the UK, about 1 in 600* people has multiple sclerosis (MS) with genes and environmental factors both playing a role. Read more about the risk of developing MS in this A-Z entry.
Information - A-Z
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Risk-sharing Scheme
The Risk-sharing Scheme is the Scheme that was introduced in 2002 to ensure the availability of the first line disease modifying drug therapies - beta interferon and glatiramer acetate - on the NHS to people with certain types of multiple sclerosis.
Information - A-Z
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Safeguarding and MS
Safeguarding means protecting people from harm, abuse and neglect. Anyone can be a risk of abuse, including people with MS who need care and support. If you or someone you know is at risk, here's how to raise a concern.
Information - A-Z
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Sativex (nabiximols)
Sativex (nabiximols) is the first cannabis-based medicine to be licensed in the UK. The drug can prescribed for the treatment for MS-related spasticity when a person has shown inadequate response to other symptomatic treatments or found their side effects intolerable. Sativex can be used in addition to a person's current anti-spasticity medication.
Information - A-Z
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Secondary progressive MS
Multiple sclerosis is a lifelong condition which affects the central nervous system (the brain and spinal cord). In secondary progressive MS (SPMS), symptoms gradually worsen and accumulate over time, known as progression.
Information - A-Z
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Second opinion
If you are not happy with the treatment you have received from a health professional, you can ask for a second opinion. Although there is no legal right to a second opinion, requests are usually accepted.
Information - A-Z
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Sexual problems for men with MS
Sexual difficulties – particularly erectile dysfunction and difficulty reaching orgasm – are common in men with MS. Sexual problems often result from a complex interaction of physical, social, psychological and emotional elements.
Information - A-Z
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Sexual problems for women with MS
Sexual difficulties are common in women with MS. Not all sexual problems will be as a direct result of multiple sclerosis and often result from a complex interaction of physical, social, psychological and emotional elements.
Information - A-Z
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Side effects
Side effects are unwanted effects caused by a medical treatment. Not everyone taking the treatment will get side effects and they are usually reversible.
Information - A-Z
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MS information & support
About MS
Newly diagnosed
Young people and MS
Living with advanced MS
Causes of MS
How common is multiple sclerosis?
Types of MS
What is MS?
Symptoms & diagnosis
Worried you have MS?
Signs and symptoms
How is MS diagnosed?
What's causing my symptoms?
MS relapses and their management
Drugs & treatments
How is MS treated?
Disease modifying therapies (DMTs)
DMTs approved for use in the UK
Compare disease modifying therapies (DMTs)
Drugs in development
Treatment finder
Non-drug therapies
Health & wellbeing
Thinking and memory problems
Staying Smart
Exercise
Diet and MS
Wellbeing
Family, care & money
Relationships and family life
Care and carers
Home and travel
Work, money and legal
Support & services
Contact our MS helpline
MS services near me
My MS expert
Order a free MS publication
Listen to our podcast
Join our Facebook group
Find support groups
A-Z of MS
Get involved
Donate
Make a donation
Make a regular donation
Donate in memory
Other ways to donate
Gift Aid
Fundraise
MS Trust Exclusives
Do it your way
Trekking and walking events
Running events
Cycling events
Daredevil events
Fundraise while you shop
Get your fundraising guide
Pay in your fundraising
Raise awareness
Bring Your MS to Work
World MS Day 2026
MS Awareness Week 2026
Volunteer
Leave a gift in your will
Corporate fundraising
Corporate giving
Payroll giving
Pharmaceutical and other industry supporters
News & stories
Latest news & stories
Keep up to date
Sign up for updates
Update your address
Send us your story
Research
Our research
For researchers
Our research leadership
Studies we support
For health professionals
Resources
Clinical learning
Professional development
Service development
Courses & training
Funding your learning
MS Trust conference
Development Module
Study days
External courses
Therapists in MS (TiMS)
About TiMS
Meet the TiMS working group
TiMS resources
TiMS newsletters
Join the TiMS network
Order publications
Latest
Latest news for HPs
Keep in touch
MS in Practice
Programmes
Advanced MS Champions programme
Case studies
MS Forward View
Shop