Flatfeet is a common condition, also known as flatfoot, in which the arches on the inside of the feet flatten when pressure is put on them. When people with flatfeet stand up, the feet point outward, and the entire soles of the feet fall and touch the floor.

Flatfeet can occur when the arches don't develop during childhood. It can also develop later in life after an injury or from the simple wear-and-tear stresses of age.

Flatfeet is usually painless. If you aren't having pain, no treatment is necessary. However, if flatfeet is causing you pain and limiting what you want to do, then an evaluation from a specialist may be warranted.


Most people have no symptoms associated with flatfeet. But some people with flatfeet experience foot pain, particularly in the heel or arch area. Pain may worsen with activity. Swelling may occur along the inside of the ankle.

When to see a doctor

Talk to your health care provider if you or your child has foot pain, particularly if it is limiting what you want to do.


Flatfeet is not unusual in infants and toddlers, because the foot's arch hasn't yet developed. Most people's arches develop throughout childhood, but some people never develop arches. People without arches may or may not have problems.

Some children have flexible flatfeet, often called flexible flatfoot, in which the arch is visible when the child is sitting or standing on tiptoes but disappears when the child stands. Most children outgrow flexible flatfeet without problems.

People without flatfeet can also develop the condition. Arches can collapse abruptly after an injury. Or the collapse can happen over years of wear and tear. Over time, the tendon that runs along the inside of the ankle and helps support the arch can get weakened or tear. As the severity increases, arthritis may develop in the foot.

Risk factors

Factors that can increase the risk of flatfeet include:

  • Obesity
  • Injury to the foot or ankle
  • Rheumatoid arthritis
  • Aging
  • Diabetes

Aug. 16, 2022
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  6. Posterior tibial tendon dysfunction. American Academy of Orthopaedic Surgeons. https://orthoinfo.aaos.org/en/diseases--conditions/posterior-tibial-tendon-dysfunction. Accessed May 22, 2022.
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