Flat feet are medically referred to as pes planus, and this affliction is common among adults. Also known as fallen arches, flat feet can create issues in the knees and ankles due to lack of support. The condition may also alter a person's alignment through their legs and beyond, placing them at a greater risk of injury when playing sports or participating in other physical activities.
While some people with flat feet won't notice any discomfort, others may develop pain in the heel and arch. The pain may worsen at night or after prolonged activity and may make the ankles swell. Having flat feet can cause excess foot fatigue because the arch does not support the soft tissues of the feet.
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