Is It Stroke or MS Symptoms? 5 Ways To Tell the Difference

Medically reviewed by Chiara Rocchi, M.D.

Written by Remi A. Kessler, M.D.

Updated on September 8, 2026

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Key Takeaways

Multiple sclerosis can cause unexpected symptoms that sometimes overlap with those of a stroke, making it important to know the differences between the two conditions.

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Multiple sclerosis (MS) can cause unexpected symptoms that sometimes don’t even feel like they’re related to MS. Issues like muscle weakness, speech problems, and vision changes may leave you wondering if something other than MS is to blame. In some instances, it can even feel like you’re having a stroke.

If you suspect a stroke, don’t wait to get help. It’s always better to err on the safe side and seek medical assistance right away. Remember, every minute matters.

That said, it’s helpful to have an idea of how MS and stroke symptoms overlap (and how they don’t). Read on to learn five ways to tell the difference between symptoms of MS and a stroke.

1. Timing Matters

The timing of your symptoms can offer some insight. During a stroke, symptoms come on suddenly and tend to peak within minutes or hours.

Stroke symptoms are severe. They often reach full force within minutes.

With MS, new or worsening symptoms can take days to build. Once they peak, symptoms usually stabilize and resolve within days.

Other stressors on the body, like an infection, can lead to pseudoexacerbations (a sudden onset of worse MS symptoms). Even a minor fever can trigger this type of MS flare-up. Fortunately, pseudoexacerbations don’t leave any lasting damage.

Gauging a Relapse

An MS relapse means MS is getting worse. The immune system is attacking different parts of the nervous system, leading to new areas of damage. MS symptoms that last for more than a day, don’t come with a fever or other potential cause, and occur more than 30 days after a previous relapse are more likely to be an MS relapse.

That said, timing isn’t always easy to gauge. For example, if someone is sleeping when a stroke happens, their symptoms may go unnoticed until the next day.

The same is true if you miss the first signs, such as very mild weakness or numbness. Additionally, confusion and trouble communicating can make it hard to get the full story of when symptoms started getting worse.

Timing is helpful, but it can’t always tell you whether you’re having a stroke or an MS flare-up. However, any new neurological symptoms should be assessed as a possible stroke just in case, especially if they’re happening fast.

2. Watch for Certain Symptoms

There’s some overlap between many symptoms from an MS relapse and stroke because both affect the nervous system. But there are a few symptoms that aren’t shared as often.

Sometimes, a stroke can cause people to lose their ability to produce or understand language. They may not be able to speak at all, or they may put words together that don’t make any sense (also called word salad). Usually, a family member will notice this change.

A stroke can also cause difficulties in understanding speech. Sudden difficulty with producing or understanding language is more common with stroke than with speech symptoms seen during an MS relapse, although there may still be overlap.

Problems with managing your bowels and bladder, pain, and muscle spasms may be less likely with a stroke, unless they come on suddenly. If you normally have these symptoms during an MS flare, it’s more likely the symptoms may be in keeping with MS.

Overlapping Symptoms

Sometimes, it’s hard to tell the difference based on symptoms alone. Symptoms that are seen in both MS flares and stroke can include:

Weakness and/or numbness of the arms, legs, or face
Changes in vision, including vision loss or blurred vision
Difficulty walking
Problems with balance or coordination
Dizziness

In addition, headaches and confusion can happen in both conditions. But these symptoms may point more toward a stroke than an MS relapse.

3. Your Background May Matter

MS is more common in women, according to the Consortium of Multiple Sclerosis Centers. It usually starts between the ages of 20 and 40.

Stroke is also more common and more deadly in women than men, according to the U.S. Centers for Disease Control and Prevention. However, age is a major factor for stroke risk. After age 55, the risk of a stroke for men and women doubles every 10 years.

Still, about one in seven strokes occurs in people under age 45. Strokes can affect people of all ages and ethnic backgrounds.

Research suggests that non-Hispanic Black adults have about twice the risk of a first stroke compared with white adults. Strokes are also more likely to be fatal among this group.

Despite these statistics, it’s important to remember that age, sex, and race can’t rule out stroke for anyone. Symptoms should always be taken seriously and investigated.

4. Your Medical History Is Important

Many factors are known to significantly increase your risk of stroke. These include:

Hypertension (high blood pressure)
High cholesterol
Heart disease
Diabetes
Obesity
Sickle cell disease

Your family history is also important. If there is a history of stroke in your family, and especially if combined with unhealthy lifestyle factors, your risk of stroke is higher.

Excessive alcohol consumption and smoking also raise your risk of stroke. Importantly, if you’ve previously had a stroke or a transient ischemic attack (TIA, also known as a “mini-stroke”) in the past, the risk of having a second stroke is higher.

MS has different risk factors than stroke. A history of certain viruses (especially Epstein-Barr infection), having another autoimmune disease, or having some genetic predisposition or a family history of MS can put you at higher risk for getting MS.

Living in regions of temperate climate and areas further from the equator also increases your risk of developing MS.

Healthy habits can help you feel your best and protect your cardiovascular system while living with MS.

5. When To Seek Emergency Care

Every second counts when a stroke could be happening. Call 911 or your local emergency medical services immediately for any possible stroke symptoms (new neurological symptoms progressing rapidly over minutes or hours).

Try to note the last time the person was well. Someone with stroke symptoms should never drive themself. Arrange a ride or take an ambulance.

Stroke is possible with any sudden onset of:

Weakness, especially on one side of the body
Numbness or tingling
Vision problems, especially in one eye
Confusion
Slurred speech or nonsensical words
Difficulty walking
Severe headache
Difficulty staying awake, or loss of consciousness

MS symptoms can vary from person to person. Because a stroke is an emergency — and can be life-threatening — it’s critical to be evaluated by an emergency room (ER) doctor right away.

In addition, the timing of the treatment window is very limited in ischemic stroke, the type of stroke that’s usually caused by a clot. So the faster you get to the ER, the better the chance of a good outcome.

If you’re not sure whether your symptoms are MS or a stroke, seek emergency medical assistance. Acting quickly can make a big difference and possibly even save your life. Once you’re safe, contact your neurologist to provide updates and discuss your care.

How Do Doctors Tell the Difference?

Once you’re under emergency care, you’ll undergo testing to check for a stroke. It’s important to tell them that you have MS and to share any medications or other health issues if possible.

The best way to tell the difference is through history taking, examination and CT scan and/or MRI scan. These are imaging studies that can help doctors see if a stroke or MS is responsible for your symptoms.

Other tests that can help make the right diagnosis include:

Blood tests

Electrical testing

A spinal tap

If testing comes back negative for a stroke, a neurologist can help screen for an MS pseudoexacerbation or relapse. A relapse may warrant a change in your MS treatment plan.