What MS Is (Autoimmune Demyelination)
Multiple sclerosis (MS) is a chronic disease of the central nervous system — the brain, spinal cord and optic nerves. In MS, the body's own immune system mistakenly attacks myelin, the fatty insulating sheath that wraps around nerve fibres. Myelin works much like the plastic insulation on an electrical wire: it lets signals travel quickly and cleanly. When it is damaged — a process called demyelination — nerve signals slow down, become garbled, or stop altogether.
The name 'multiple sclerosis' means 'many scars'. Each attack leaves an area of scarring (a plaque or lesion) at the site of damage, and these lesions are scattered across different parts of the brain and spinal cord at different times. This is the essence of MS — damage that is disseminated in both space (different locations) and time (different occasions). It explains why symptoms are so varied and why they can come and go.
Because any part of the central nervous system can be affected, MS can produce almost any neurological symptom — from blurred vision to a weak leg to numbness to bladder trouble. This variety is exactly why MS can be difficult to recognise, and why it has historically been under-diagnosed. It most often begins in young adults, between about 20 and 40, and affects women more than men.
Why MS Was Thought Rare in India — It Was Underdiagnosed
For many decades, textbooks taught that MS was uncommon in India and in tropical countries generally. That belief shaped practice: when a young Indian adult developed vision loss, a weak limb or unexplained numbness, MS was often not even considered, and the episode was blamed on something else or left unexplained.
We now understand that much of that supposed rarity was in fact under-diagnosis. The single biggest reason is that MS is difficult to diagnose without MRI scanning — and until recent decades, MRI was scarce and expensive across most of India. A relapsing-remitting illness whose attacks come and go, and whose diagnosis depends on a scan few people could access, was always going to be missed. When symptoms recovered on their own, patients and doctors alike assumed the problem had resolved for good.
Today the picture has changed dramatically. MRI is now widely available in cities like Mohali and Chandigarh, awareness among neurologists has grown, and diagnostic criteria have been refined. As a result, MS is being recognised far more often — not because it has become more common, but because we can finally see it. The important lesson for patients is that MS does occur in India, it should be considered in any young adult with unexplained neurological symptoms, and the tools to diagnose it are now within easy reach.
Symptoms (Optic Neuritis, Limb Weakness, Sensory Loss, Bladder Problems, Fatigue)
Because MS can strike anywhere in the central nervous system, its symptoms are wide-ranging. Certain patterns, however, are especially characteristic and worth knowing.
- Optic neuritis — one of the classic first presentations. The optic nerve becomes inflamed, causing blurring or loss of vision in one eye over hours to days, typically with pain on moving the eye and dulling of colours (reds look washed out). Vision usually recovers, but a first episode of optic neuritis should always prompt a search for MS.
- Limb weakness — a leg or arm becoming weak, heavy or clumsy, sometimes with stiffness (spasticity).
- Sensory loss and abnormal sensations — numbness, tingling, a band-like tightness around the trunk, or an electric-shock sensation running down the spine on bending the neck forward (Lhermitte's sign).
- Bladder problems — urgency, frequency, or difficulty emptying, which are common and treatable but often go unmentioned out of embarrassment.
- Fatigue — a profound, disproportionate tiredness that is one of the most common and disabling symptoms, and quite different from ordinary tiredness.
Other features include double vision, imbalance, dizziness, and problems with concentration. A hallmark of MS is that a symptom appears, lasts days to weeks, then improves — only for a different symptom to appear later. That pattern of separate episodes affecting different parts of the body is a strong clue.
The Relapsing-Remitting Pattern
The most common form of MS — affecting the large majority of patients at onset — is relapsing-remitting MS (RRMS). Understanding this pattern helps make sense of the whole disease.
In RRMS, symptoms come in relapses (also called attacks or flares): a new symptom, or worsening of an old one, develops over hours to days, lasts for days to weeks, and then partially or fully recovers during a period of remission. Between relapses, the person may feel entirely well. Relapses reflect fresh inflammation and demyelination; the recovery reflects the nervous system's ability to repair and re-route around the damage, at least early on.
Over many years, some people with RRMS gradually transition to a secondary progressive phase, where disability slowly accumulates even without clear relapses. A smaller group have primary progressive MS from the outset, with steady progression rather than distinct attacks. The crucial modern insight is that treating early, during the relapsing-remitting phase, can slow or prevent this progression — which is why prompt diagnosis and starting the right therapy matters so much.
How MS Is Diagnosed (MRI, and Supporting Tests)
There is no single test that says 'yes, this is MS'. The diagnosis is made by a neurologist who pieces together the clinical story, the examination, and investigations to demonstrate damage disseminated in space and time — in more than one location and on more than one occasion — while carefully excluding conditions that can mimic MS.
The cornerstone is MRI of the brain and spinal cord. MRI reveals the characteristic lesions of MS, shows their typical locations, and — using a contrast dye (gadolinium) — can tell active, recent lesions from older ones, helping establish the 'time' element. Modern diagnostic criteria allow a confident diagnosis from a well-timed MRI in many cases.
Supporting tests help confirm the picture and rule out mimics. A lumbar puncture examines the spinal fluid for oligoclonal bands — a sign of immune activity within the central nervous system that supports the diagnosis. Visual evoked potentials can detect slowed signals in the optic nerve, revealing past optic-nerve damage even where vision seems normal. Blood tests are used to exclude other causes such as B12 deficiency, thyroid disease, and other autoimmune or infective conditions that can imitate MS. Getting this diagnosis right is essential, because the treatment is specific and lifelong.
Disease-Modifying Therapies Available in India
The treatment of MS has two distinct arms, and it is important to understand the difference. Treating a relapse — typically with a short course of high-dose steroids — speeds recovery from an acute attack but does not change the long-term course. The more important arm is disease-modifying therapy (DMT), taken continuously to reduce how often relapses occur and to slow the build-up of disability over the years.
A growing range of DMTs is now available in India, and choosing among them is a careful, individual decision balancing effectiveness, side effects, monitoring needs and cost. Broadly they include:
- Injectable therapies — long-established options such as interferons and glatiramer acetate, with a good long-term safety record.
- Oral therapies — tablets such as fingolimod, dimethyl fumarate and teriflunomide, which are convenient and increasingly used.
- Higher-efficacy infused therapies — monoclonal antibodies given by infusion (such as natalizumab and ocrelizumab) for more active disease, requiring closer monitoring.
The modern approach is to start an appropriate DMT early, monitor the response with periodic MRI, and escalate to a stronger agent if the disease remains active. Dr. Iqbal Singh discusses these options frankly with each patient — including realistic cost and monitoring — so the plan fits the person's disease activity and circumstances.
Living With MS and Prognosis (Better Than Most People Think)
The word 'multiple sclerosis' still carries a frightening, outdated image — of inevitable wheelchairs and rapid decline. For most people diagnosed today, that image is simply wrong. The prognosis of MS has been transformed by early diagnosis and effective disease-modifying therapy, and the great majority of people with MS continue to work, raise families, travel and live full, active lives.
Living well with MS involves more than medication. Managing fatigue — through pacing, exercise, good sleep and treating any depression or sleep disorder — makes a real difference to daily life. Regular physical activity and physiotherapy help maintain strength, balance and mobility, and are safe and beneficial, contrary to old advice to rest. Bladder symptoms, spasticity, pain and mood can all be treated. Staying up to date with vaccinations and general health, and avoiding smoking (which worsens MS), all support a better course.
Pregnancy is generally safe in MS and relapses often reduce during pregnancy, though planning around medication with a neurologist is important. The overall message we give patients at Gini is one of realistic optimism: MS is a serious condition that needs proper, lifelong management, but with modern treatment and good support, it is very far from the sentence people fear.
The Role of Vitamin D in MS (Particularly Relevant for India)
One of the most striking observations in MS research is the link with vitamin D. MS is more common further from the equator, where sunlight — and therefore natural vitamin D production — is lower, and studies consistently associate low vitamin D levels with a higher risk of developing MS and with more active disease in those who already have it.
This has real relevance for India, because despite our abundant sunshine, vitamin D deficiency is extremely common here. Modern indoor lifestyles, extensive covering of the skin, air pollution reducing effective sunlight, darker skin needing more sun exposure, and diets low in vitamin D all combine so that a large proportion of Indians are deficient — a fact that surprises many patients. Low vitamin D is therefore worth checking and correcting in people with MS.
It is important to be balanced about what this means. Correcting a vitamin D deficiency is sensible, safe and good for bone and general health, and is part of good MS care. However, vitamin D is not a substitute for disease-modifying therapy, and taking very high, unsupervised doses can be harmful. The right approach is to check the level, correct any deficiency under medical guidance to a healthy range, and continue proven MS treatment alongside it. Dr. Iqbal Singh routinely reviews vitamin D as part of comprehensive MS management.