Feet usually have an arch on the inside portion of the foot. A flat foot is a foot that has lost or never developed this arch. It is often associated with the lower part of the legs being angled outwards
Most flat feet are flexible. This type rarely causes problems and usually does not require treatment. Rigid flat feet can cause problems and should be treated.
Normal Foot Arch
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Infants and young children naturally have flat feet. The arch should develop over time. Sometimes, the arch does not develop. It is not always clear why this happens.
Flat feet may develop because of: Ruptured or damaged tendon that supports the archMedical conditions that affect muscles or nerves in the footDegenerative changes in certain foot jointsLigament damage in the foot
Factors that increase your chance of flat feet include: Family history
Diseases that cause muscle or nerve damage, such as peripheral neuropathy,
spina bifida, or
muscular dystrophyFoot injuriesConditions of the feet that can injure foot tissue, such as osteoarthritisConditions present at birth, such as excess laxity of joint capsules and ligaments, such as Ehlers-Danlos syndromeObesity
Flat feet may not cause any symptoms at all. Rigid flat feet may cause: PainCalluses, blisters,
or skin redness
on the inner side of the foot
A stiff footWeakness or numbness of the footRapid wearing out of shoes—worn shoes lean in toward each otherDifficulty or pain with activities like running—in the foot, knee or hip
The doctor will ask about your symptoms and medical history. A physical and foot exam will be done. Flat feet can be diagnosed by appearance. Doing simple tasks during the exam can help determine if the foot is rigid.
If the flat foot is rigid and causing problems, treatment will be with a foot specialist. Flat foot treatment options may include:
Physical therapy may relieve discomfort. A specific stretching and strengthening program may be used. Exercises can help with the strength of the surrounding muscles. They may relieve some of the pressure in the foot.
Orthotics are shoe inserts that support the foot. These inserts may help to reduce pain and disability in some people. In mild cases, a well-fitting pair of shoes with arch support may be all that is needed.
Flat feet caused by nerve or muscle disease may need special braces.
Feet that do not respond to the treatments above may need surgery. The surgery will help to create a supportive arch.
Well-fitted shoes with good arch support may help prevent flat feet.
Maintaining a healthy weight may also lower wear and tear on the arches.
Adult acquired flatfoot. American Academy of Orthopedic Surgeons Ortho Info website. Available at:
http://orthoinfo.org/topic.cfm?topic=A00173. Updated December 2011. Accessed March 2, 2015.
Flat foot signs and symptoms. UCSF Children’s Hospital website. Available at:
Accessed March 2, 2015.
Last reviewed March 2016 by James Cornell, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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