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I don’t think I’ve looked forward to the “summer” since I was in school. It’s totally different with multiple sclerosis because it feels like I need to strap on a proverbial suit of armor to fight with nature. Guess who wins? If I don’t play smart, it’s definitely not me. If you’re living with MS, you probably know the feeling: a strange new symptom hits — weakness, blurred vision, maybe even slurred speech — and panic creeps in. Is it another MS relapse? Or could it be something more urgent, such as a stroke (why can’t it ever be something simple)?

It’s a scary question, and an important one. While MS can mimic many stroke symptoms, the two are very different — and stroke is a medical emergency that requires immediate attention. So how can you tell them apart?

Here are five key ways to help you and your loved ones spot the difference.

Timing is everything

Stroke symptoms often appear suddenly, within minutes. You might be fine one moment and unable to speak, walk, or move part of your body the next. MS relapses typically develop over hours or even days, and may worsen gradually. That said, if symptoms hit while you’re sleeping, or if you don’t notice mild symptoms right away, timing might not be clear — so don’t rely on this alone.

Know the symptoms that set stroke apart

MS and stroke can share a lot of symptoms — numbness, weakness, confusion, vision problems. But there are a few signs that tend to show up more in stroke than MS: sudden slurred speech or speaking gibberish (“word salad”), trouble understanding others, one-sided weakness (especially in the face or arm), and sudden, severe headache.

MS symptoms such as bladder issues, spasms, or chronic pain are rarely seen in stroke, so if you’re experiencing your usual flare symptoms, it may not be a stroke — but don’t guess.

Your background and risk factors matter

Stroke is more common in:

• Adults older than 65
• People with high blood pressure, diabetes, or heart disease
• African American and Hispanic individuals
• People with a family history of stroke

MS, on the other hand, is more common in:

• Women ages 20–50
• People of European descent
• Those with autoimmune conditions or low vitamin D exposure

But here’s what’s critical: People with MS have a higher risk of stroke than the general population. So it’s important not to dismiss stroke symptoms just because you’re younger or think “this is probably just MS.”

What’s in your health history

If you smoke, have high blood pressure, high cholesterol, or a previous stroke, your stroke risk is higher — with or without MS. Likewise, if you’re living with MS and notice new or worsening symptoms, it’s still crucial to rule out stroke before assuming it’s a relapse.

When to go to the emergency room

Here’s the golden rule: if symptoms come on suddenly or feel “different,” get emergency care right away. Call 911 or go to the ER immediately if you or someone you love experiences:

• Sudden numbness or weakness (especially on one side)
• Slurred speech or confusion
• Trouble walking or staying balanced
• Blurred or lost vision
• A severe headache
• Difficulty staying awake

It’s better to be safe and get checked than to wait it out. Stroke treatment is time-sensitive. Every minute counts.

How heat can complicate it all 

Many people with MS experience Uhthoff’s phenomenon — a temporary worsening of symptoms because of heat (from sun, showers, or even spicy food). These symptoms can include:

• Blurred vision
• Muscle weakness
• Balance issues
• Fatigue and mental fog

These heat-triggered flares can feel like a relapse or stroke — but usually resolve once the body cools down. That said, you should never assume it's “just the heat.” If symptoms are sudden, severe, or different from your norm — especially in summer — get evaluated quickly. It could be heat, or it could be something more serious.

MS is unpredictable — but a stroke can be life-altering or life-threatening. If you ever feel unsure, trust your gut and get checked. And talk to your doctor about how to manage stroke risk on top of your MS care plan.