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Should You Wear Bigger Shoes When Running?

Choosing the right running shoe size is one of the most important—and often overlooked—factors in preventing foot pain and injury. Many runners have heard they should size up, but is that actually true?

The short answer: slightly bigger running shoes are usually recommended—but not too big. The goal is a precise fit that allows for natural foot movement without causing instability.

Why Runners Often Need Bigger Shoes

When you run, your feet behave differently than when you’re standing still.

  • Feet swell during activity due to increased blood flow
  • Impact forces cause your foot to expand and spread
  • Downhill running pushes your toes forward

Because of this, wearing your exact everyday shoe size can lead to discomfort and injury over time.

How Much Bigger Should Running Shoes Be?

A general guideline is to leave about a finger’s width (½ inch) of space between your longest toe and the front of the shoe.

This extra room helps:

  • Prevent black toenails
  • Reduce pressure on the toes
  • Avoid blisters and nail trauma

However, sizing up too much can create new problems.

What Happens If Your Running Shoes Are Too Small?

Shoes that are too tight can cause:

  • Blisters and calluses
  • Black or bruised toenails
  • Ingrown toenails
  • Increased risk of conditions like hammertoes
  • General foot pain and numbness

Over time, repeated pressure can lead to chronic issues.

What Happens If Your Running Shoes Are Too Big?

Bigger isn’t always better.

Oversized shoes can lead to:

  • Heel slipping
  • Instability while running
  • Increased friction and blistering
  • Poor running mechanics

The goal is roomy—not loose.

Signs Your Running Shoes Fit Properly

A well-fitting running shoe should:

  • Have about ½ inch of space at the toe box
  • Feel snug (but not tight) around the midfoot
  • Hold your heel securely without slipping
  • Allow your toes to wiggle freely

Trying shoes on at the end of the day—when your feet are slightly swollen—can help you find the best fit.

Do You Always Need to Size Up?

Not necessarily. Shoe sizing varies between brands and styles, so focus more on fit than the number on the label.

You may need to size up if:

  • You’re running long distances
  • You experience toe pain or bruising
  • Your feet swell significantly during activity

But if your current shoes already meet the fit criteria above, you may not need a larger size.

Tips for Choosing the Right Running Shoes

  • Try shoes on with your running socks
  • Test them later in the day
  • Walk or jog in-store if possible
  • Replace shoes regularly (every 500–800 km)
  • Consider a professional fitting if you have recurring foot pain

The Bottom Line

Yes, most runners benefit from wearing slightly bigger shoes—but only enough to allow for natural foot expansion. The right fit can help prevent common running injuries and keep you comfortable mile after mile.

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At Feet First Clinic, we’re always excited to welcome new clients! We’re Toronto’s one-stop-shop for all your foot-related needs. Since 2009, our staff and licensed chiropodists have been helping people with their feet. From foot care to foot pain to foot products – we do it all! Give us a call to ask our friendly staff any questions you may have! Our Toronto foot specialists are ready to help!

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Carolina Charles

Patient Relation Coordinator (She/Her)

If you’ve been to the clinic before, chances are you had the pleasure of meeting Carolina! Carolina’s daily goal is going above and beyond to make sure patients are always completely satisfied. Having worked in the podiatry industry for 22 years, Carolina brings a wealth of knowledge pertaining to client service, insurance policies, and procedures.​ She steers the ship to make sure everything runs smoothly on the daily. Carolina is known for spicing up every outfit with her signature costume jewellery.