Most flat feet do not need to be “cured” because most flat feet are not a disease. The majority of people with low or absent arches have what clinicians call flexible flatfoot, a structural variation that causes no pain and requires no treatment. When flat feet do cause trouble, though, the discomfort can ripple from the ankle all the way up to the knee and hip. In those cases, a combination of targeted exercises, orthotics, calf stretching, and occasionally surgery can reduce pain and improve function. The strategy depends on what is driving your symptoms, how severe the deformity is, and whether you are dealing with a childhood foot that is still developing or an adult arch that has progressively collapsed.
When Flat Feet Actually Need Treatment
A flat foot is simply one where the medial longitudinal arch sits lower than average or contacts the ground entirely during standing. In a flexible flatfoot, the arch reappears when you sit down or rise onto your toes. In a rigid flatfoot, the arch stays flat regardless of position, usually because of a bony or joint abnormality. The flexible type is far more common and far less likely to cause problems. A rigid flatfoot almost always warrants medical evaluation because it tends to arise from other conditions like tarsal coalition or arthritis.
Flexible flatfoot on its own is not automatically a reason for concern. Researchers have noted that the causes are still debated but can range from general ligament laxity to intrinsic foot issues, and that if the foot is painless, neither imaging nor treatment is necessarily required.1Europe PMC. Flexible flatfoot The practical takeaway: if your flat feet don’t hurt, don’t limit your activity, and aren’t getting progressively worse, you may not need to do anything at all.
Adult-acquired flatfoot deformity is a different story. This involves a progressive collapse of the arch in someone who previously had a normal one, often driven by failure of the posterior tibial tendon, the main tendon that holds the arch up. It has been linked to obesity, diabetes, hypertension, and other systemic factors.2PubMed Central. Adult-Acquired Flatfoot Deformity If you notice your arch dropping on one side, especially in middle age, that is worth a visit to a specialist sooner rather than later.
Children and Flat Feet
Parents often worry when they see their toddler’s feet pressing flat against the floor, but this is entirely normal. All typically developing children are born with flat feet and progressively develop an arch during the first decade of life. A systematic review of pediatric foot development found that flat foot posture is the norm through at least the first three years, with most arch measurements reaching what researchers call “normal” range somewhere between ages four and eight, depending on the measurement used.3PubMed Central. The typically developing paediatric foot: how flat should it be? A systematic review
The same review made an important point: calling a young child’s foot “flat” implies something is wrong, when in reality a flat posture is age-appropriate and healthy. A six-year-old with flat feet is not behind schedule. There is no reason to rush into arch-support insoles or corrective shoes for a child whose feet are painless and developing on a normal timeline. Intervening too early can create anxiety without changing outcomes. The time to act is if a child reports persistent foot or leg pain, has a rigid flatfoot that does not correct when they stand on tiptoe, or shows no arch development well into the second decade of life.
Exercises That Strengthen the Arch
If you do need to address symptomatic flat feet, exercise is the first-line tool, and the evidence points toward a few specific approaches rather than generic “foot exercises.”
Short foot exercises are the most studied option. The idea is to shorten the foot by pulling the ball of the foot toward the heel without curling the toes, which activates the intrinsic muscles of the foot that support the arch from below. A review of the research confirmed that this type of exercise can improve arch height and reduce pain by actively contracting the plantar muscles.4PubMed Central. Short foot exercises for flatfoot therapy: Status and prospects However, a separate meta-analysis found the picture is more nuanced: pooled results showed no significant improvement in arch measurements from short foot exercises compared to controls unless the training lasted more than six weeks. Only after that threshold did navicular drop (a measure of how much the arch sags under load) improve meaningfully.5PubMed. Effects of short foot training on foot posture in patients with flatfeet: A systematic review and meta-analysis In other words, these exercises work, but only if you stick with them. A few sessions won’t change your foot structure.
Tibialis posterior strengthening adds another layer. A randomized clinical trial tested a program of selective tibialis posterior exercises combined with hip-flexor stretching against conventional towel-curl exercises alone. The combined group saw significant improvements in navicular drop, dynamic balance, and muscle activation, beyond what towel curls alone produced.6PubMed. Effects of selective strengthening of tibialis posterior and stretching of iliopsoas on navicular drop, dynamic balance, and lower limb muscle activity in pronated feet: A randomized clinical trial Towel curls (scrunching a towel with your toes) remain a reasonable starter exercise, but adding exercises that target the posterior tibial tendon and the hip flexors appears to deliver better results.
Concentric exercises, where the muscle shortens under load, also showed measurable improvement in weight-bearing arch position in a randomized trial, though the gains were modest and the differences between concentric and eccentric training were not statistically significant.7Saudi Journal of Sports Medicine. Effects of concentric and eccentric exercises in the rehabilitation of flexible flat foot – A randomized trial The honest read of the exercise literature is that strengthening the foot and ankle muscles helps, but the structural changes are small and require consistent effort over months.
Why Calf Stretching Matters
One of the most overlooked factors in flat feet is calf tightness. When the gastrocnemius or the Achilles tendon is tight, ankle dorsiflexion (pulling your foot toward your shin) becomes limited. To compensate, the foot pronates excessively, essentially collapsing inward to find the range of motion the ankle cannot provide. Research has found a convincing relationship between this kind of calf tightness and the development of flatfoot deformity.8PubMed. The role of isolated gastrocnemius and combined Achilles contractures in the flatfoot
A systematic review looking at pediatric flat feet with calf tightness made the case that this combination is more clinically important than flat feet alone, because the tightness can lead to pain and disability down the road. Stretching and orthotic management were recommended as conservative treatments for this specific subgroup.9Prosthetics & Orthotics International. Impact of night orthotic managements on gastroc-soleus complex tightness in pediatric with flexible flatfoot: Systematic review Another systematic review echoed this, concluding that limited ankle dorsiflexion is one of the main factors causing overpronation, and that improving ankle mobility leads to better foot posture and balance.10Journal of Mechanics in Medicine and Biology. Effectiveness of Myofascial Release and Stretching of Calf Muscle in Exercises for Flat Foot Intervention: A Systematic Review
If you have flat feet and tight calves, stretching is not just a nice addition to your routine; it may be addressing one of the root causes. Standard wall stretches targeting the gastrocnemius (with the knee straight) and soleus (with the knee slightly bent) are the simplest approach. Holding each stretch for 30 seconds and repeating a few times daily is a reasonable starting protocol. If you have significant tightness, a physical therapist can add myofascial release or use a night splint to maintain a stretched position overnight.
Orthotics and Insoles
Arch-support insoles are the most common intervention for flat feet, and they come in two broad categories: off-the-shelf prefabricated insoles and custom-molded orthoses made from a scan or cast of your foot. The natural assumption is that custom is always better. The research tells a more complicated story.
A study comparing custom and prefabricated prescription-grade orthoses in over 230 patients found that both groups reported significant improvement in pain and function. Custom orthoses edged out the prefabricated ones on one measure of physical function and had higher satisfaction scores (about 8.1 out of 10 versus 7.5), but there was no significant difference between the two in pain relief, mobility, or overall ankle and foot outcomes.11PubMed Central. Comparing the Utility of Custom Foot Orthoses vs Prescription-grade Prefabricated Foot Orthoses A separate study using 3D-printed custom insoles found they did a better job of redistributing pressure in the midfoot, which is important for correcting the load pattern in symptomatic flatfoot.12PubMed Central. Comparative Study of the Effects of Customized 3D printed insole and Prefabricated Insole on Plantar Pressure and Comfort in Patients with Symptomatic Flatfoot Meanwhile, another trial comparing computer-designed custom orthoses to prefabricated ones found that both decreased pressure under the heel and metatarsal regions, and the custom design did not produce a great difference in pressure distribution.13PubMed. Comparison of plantar pressure distribution in CAD-CAM and prefabricated foot orthoses in patients with flexible flatfeet
The practical message: a good prefabricated insole with a firm medial arch support can be an effective starting point, especially given that custom orthotics can cost several hundred dollars. Custom orthoses may be worth pursuing if prefabricated ones don’t relieve your symptoms, or if you have significant asymmetry between your two feet. What matters more than the label “custom” is that the device actually supports the arch and feels comfortable enough to wear consistently. An orthotic sitting in a drawer helps no one.
Taping for Short-Term Relief
Athletic tape applied to the foot can temporarily lift the arch and reduce pronation. A meta-analysis of taping techniques found that three anti-pronation methods all significantly increased navicular height immediately after application, with augmented low-Dye taping producing the largest lift (close to 5 mm on average). After 10 minutes of walking the arch was still higher than baseline, though the tape loosened somewhat.14PubMed Central. Effects of taping techniques on arch deformation in adults with pes planus: A meta-analysis Kinesio tape applied over the posterior tibial tendon and transverse arch has also shown promise in runners with flexible flatfoot, reducing arch drop and increasing tibialis anterior muscle activity during the first 15 minutes of running.15PubMed. Effects of Kinesio tape on supporting medial foot arch in runners with functional flatfoot: a preliminary study
Taping is not a long-term fix. The tape loses tension within hours, you need to reapply it before every activity, and it can irritate the skin with repeated use. Where it shines is as a diagnostic and temporary tool: if taping your arch relieves your symptoms, that is useful information suggesting that an orthotic or an exercise program targeting the same support structures could help over the longer term. Athletes sometimes use taping during competition when an orthotic does not fit comfortably in a racing shoe.
How Flat Feet Affect the Rest of Your Body
Your foot is the foundation of the kinetic chain, and when the arch collapses, the effects travel upward. Flat feet cause the ankle to roll inward, which rotates the tibia (shinbone) internally, which can alter how the knee tracks. Cross-sectional research has found a relationship between reduced arch height and increased severity of anterior knee pain, because the malalignment changes knee-joint mechanics.16International Journal of Health Sciences and Research. Relationship of Anterior Knee Pain and Flat foot: A Cross-Sectional Study
Biomechanical studies add detail. Lower arch height has been associated with greater ankle eversion moments and greater internal knee abduction moments during walking, which are forces that push the knee outward and stress the medial compartment.17PubMed Central. Effects of obesity and foot arch height on gait mechanics: A cross-sectional study A study of children and adolescents with flexible flatfoot found they had lower ankle strength, less hindfoot inversion velocity at push-off, and generated less ankle power for propulsion compared to kids with normal arches.18PubMed. Foot kinematics and running dynamics in children and adolescents with flexible flatfoot For runners and athletes, this can translate into earlier fatigue and a higher loading rate during heel striking, which some researchers believe raises injury risk.
Insoles can partially address these downstream effects. One biomechanical study found that wearing an insole reduced the medially directed force on the leg during walking and improved walking speed in people with flat feet, although it did not change range of motion at the ankle or moments transmitted through the hip and knee.19Journal of Mechanics in Medicine and Biology. Influence of Foot Insole on the Gait Performance in Subjects With Flat Foot Disorder Insoles seem to help the foot itself and the immediate area above it, but the further up the chain you go, the less direct their effect.
Weight, Balance, and Other Contributing Factors
Body weight plays a role on both sides of the equation. Higher BMI has been associated with greater plantar-flexion moments at the ankle during walking, essentially making the foot work harder with each step.17PubMed Central. Effects of obesity and foot arch height on gait mechanics: A cross-sectional study Excess weight also accelerates the collapse of a weakening posterior tibial tendon, which is why obesity is one of the strongest risk factors for adult-acquired flatfoot. If you are overweight and dealing with progressive arch collapse, addressing weight can reduce the mechanical load on the structures trying to hold the arch up.
Balance is another area where flat feet create subtle deficits. Arch collapse changes proprioception, the body’s sense of where it is in space, which can make standing balance less stable. A systematic review and meta-analysis found that transverse-arch insoles (supporting the arch across the width of the foot rather than the classic medial longitudinal arch) immediately improved static balance, whereas standard medial arch-support orthoses did not show a significant balance effect during the study periods examined.20PLoS ONE. Effect of foot orthoses on balance among individuals with flatfoot: A systematic review and meta-analysis Textured insoles, which stimulate the plantar surface with raised bumps or ridges, have also improved balance in people with flexible flat feet, likely by enhancing sensory feedback from the sole of the foot.21PubMed Central. Immediate Effect of Textured Insole on Static Balance in Individuals With Flexible Flatfoot For older adults with flat feet who are concerned about fall risk, textured or transverse-arch insoles may be worth exploring alongside standard arch supports.
When Surgery Becomes the Conversation
Surgery enters the picture when months of conservative treatment have failed to control pain or when the deformity is severe and progressive. There is no single “flatfoot surgery.” Instead, surgeons choose from a menu of procedures tailored to the stage of deformity and the structures involved.
Common options include calcaneal osteotomy, where the heel bone is cut and shifted to realign the hindfoot. The medial calcaneal slide moves the heel inward to rebalance weight-bearing, while the Evans lateral column lengthening inserts a bone wedge to lengthen the outer side of the foot and raise the arch. A comparative study found that lateral column lengthening produced greater initial realignment than medial translational osteotomy, and that advantage persisted at follow-up.22PubMed. A comparison of lateral column lengthening and medial translational osteotomy of the calcaneus for the reconstruction of adult acquired flatfoot Other procedures include the Cotton osteotomy (opening a wedge in the midfoot to plantarflex the first ray), subtalar joint arthroereisis (placing a spacer in the subtalar joint to limit pronation), and various arthrodesis procedures that fuse rearfoot joints for severe or arthritic cases.23PubMed Central. A pictorial review of reconstructive foot and ankle surgery: evaluation and intervention of the flatfoot deformity
These surgeries carry real trade-offs. Recovery from a calcaneal osteotomy typically means six to eight weeks of non-weight-bearing followed by months of gradual return to activity. Fusion procedures limit joint motion permanently in exchange for stability. And the outcomes are not universally excellent; some patients develop stiffness, adjacent joint problems, or recurrence. Surgery is usually reserved for stage II or higher adult-acquired flatfoot deformity, where the tendon damage is significant and the bones have begun to shift out of alignment. A surgeon’s recommendation should come only after a thorough trial of exercises, orthotics, and activity modification has fallen short.
An Evolutionary Footnote
If flat feet feel like a design flaw, it may help to know that the human arch is an evolutionary newcomer that not all our ancestors shared. Studies of the famous 3- to 3.7-million-year-old hominin Australopithecus afarensis (“Lucy”) found evidence of a flat foot, although other specimens from the same species at the same site showed signs of a rearfoot arch.24PubMed Central. Flatfoot over the centuries: the background of current conservative and operative treatments – Section: The evolution of feet: from quadrupeds to bipeds Arch variation, in other words, has been with us since before we were fully “us.” Modern populations that habitually walk barefoot tend to develop higher, more muscular arches than shod populations, suggesting that the shoe-wearing habit of the last few thousand years has probably weakened intrinsic foot muscles and contributed to the high prevalence of flat feet in industrialized countries. A randomized controlled trial of four weeks of walking in minimalist shoes found a significant between-group effect on foot posture scores in young adults, though the changes were modest and the time-by-group interaction was not significant.25PLoS ONE. A four-week minimalist shoe walking intervention influences foot posture and balance in young adults–a randomized controlled trial Minimalist footwear is an area of active research, and it is too early to recommend it as a flatfoot treatment, but the connection between foot-muscle use and arch integrity is clear enough to justify spending more time barefoot on safe surfaces as a general foot-health practice.