Why Do Your Toenails Hurt After Running?

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Have you noticed that after a long run, a couple of my toenails are throbbing like they are bruised? You probably wonder whether this it is common for toenails to hurt after running and what you should do to prevent it.

Causes

Your toenails are sore and throbbing after a run because your toes are being slammed into the tip of the toebox of your shoe with every step, especially as you go downhill. There are a couple of elements that can contribute to this:

  • Your shoes are too small. Your running shoes should be one-half to a full size bigger than your regular shoe size because your feet will swell when you run and you need plenty of room in the toebox.
  • Your shoes are too big or worn too loose. If you have a sloppy fit, your foot may slide around more in the shoe with each step. This can contribute to more toenail trauma with each step.

Signs and Symptoms

Sore toenails may simply be tender when you press on the nail or throb even when don't touch them. In additions, you could experience foot problems such as black toenails (which usually start as that throbbing pain in your toenails), blisters, or foot numbness.

Diagnosis

If you're wondering if your current running shoes are the correct size, check the location of your big toe. If it's pushed right up against the front of the shoe, they're too small. Another easy way to check the fit is to remove the shoe's insert and stand on it.

If any part of your toes are hanging over the end of the insert, your running shoes are too small.

Treatment

When you experience sore toenails, you will want to give them a chance to heal for a few days. You may want to wear open-toed shoes where they will not have any further trauma until they are no longer tender.

If redness develops or the pain worsens, you should see your doctor to be sure that you don't have an infection and get treatment if you do.

You may notice that you are developing a black toenail, which will probably lead to losing the toenail. While this can be distressing, it happens to many runners and the toenail will grow back.

Preventing Sore Toenails

One of the best tips for sore toenails is to learn to lace your shoes to retain your heel in the heel cup and prevent your feet from sliding forward in the shoe with each step. Use a simple lacing technique to prevent heel slippage. This is especially important for running routes that include downhill sections. You should stop and ensure your shoes are laced correctly before any significant downhills.

If your shoes have a sloppy fit, you can wear a thicker running sock. Look for versions that have more padding. You can even wear two pairs of socks. Lacing techniques can also help shoes fit better.

But the bottom line is also that you need to get shoes that are the right size. When shopping for running shoes, make sure you go to a specialty running store and have the salesperson measure your feet. Even if you think you know your shoe size, your feet can get wider and longer (due to falling arches), even as an adult.

Also, it's best to try on new running shoes after a long run or at the end of the day, when your feet are already swollen.

A Word From Verywell

Sore toenails are a sign that you need to pay attention to the fit of your shoes. With the right fit and lacing techniques, you will reduce your risk of foot blisters and losing toenails. While toenail trauma is so common that it is a meme among marathoners, you don't have to join that club.

Source:

Subungual Hematoma, American Osteopathic College of Dermatology. http://www.aocd.org/?page=SubungualHematoma.

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