What causes foot blisters?

Blisters in any location are caused by increased friction between your skin and an external object. If your footwear is loose and allows your feet to move around quite a bit, you will get blisters. If your footwear fits well, this excessive motion will not be present and you should not get blisters. 

If your socks are too large and become bunched up inside of the shoe, this may also be the cause of your blisters. 

To address the issue of blisters, purchase properly fitting footwear and use clean socks every day. 

There are a few different causes of foot blisters. Common ones include:

  • Friction, heat, and moisture
  • Allergic reactions
  • Fungal infections of the skin
  • Feet sweating excessively
  • Inappropriate shoes or socks may cause excessive friction

Blisters are caused by friction. Friction causes heat and fluids build-up beneath the part of the skin being rubbed, causing pressure and pain.


  • Heat, moisture and friction.
  • Inappropriate shoes or socks.
  • Excessive foot perspiration.

To avoid them try to:

  • Wear shoes that fit properly.
  • Keep feet as dry as possible.
  • Give the area chance to heal. 
Take care!

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.