Flexible Flat Feet: When to Monitor and When to Assess
Flat feet worry a lot of parents and adults — but a low arch is often just a normal variation, not a problem to be fixed. The real question isn’t “is the arch low?” It’s “is the foot comfortable and working well?”
A flexible flat foot is one where the arch flattens when standing but reappears when you go up on your toes or when the foot is off the ground. This is very common and, in most people, painless. It sits at one end of the normal range of foot shapes. A rigid flat foot — one that stays flat regardless — is a different situation and does warrant assessment.
Children: reassurance first
Most young children have flat-looking feet because the arch is still developing and there’s often a normal fat pad under it. Arches commonly develop through childhood, and a flexible flat foot that is painless and doesn’t limit activity usually needs monitoring, not treatment. It’s worth a closer look if there is pain, the child tires or avoids activity, walking looks noticeably off, or the foot is stiff rather than flexible.
Adults: it depends on symptoms
Plenty of adults have flexible flat feet with no trouble at all. When a flat foot does cause symptoms — aching after standing or walking, or related foot and lower-limb pain — then it’s worth assessing calf flexibility, foot and hip strength, footwear and load. A flat foot that is becoming progressively flatter, stiffer or more painful in adulthood should always be assessed, as this can point to a specific problem rather than a lifelong normal variant.
What actually helps
For symptomatic flat feet, evidence in adults shows foot orthoses can reduce pain compared with no orthoses or sham devices. In children, the evidence is more mixed and less certain, so orthoses tend to be reserved for those with genuine symptoms rather than used routinely for the appearance of a flat foot. Alongside — or instead of — orthoses, calf stretching, foot and hip strengthening, sensible footwear and gradual loading all play a role.
Key points
- A flexible, painless flat foot is usually a normal variation.
- Symptoms and function matter more than the height of the arch.
- In children, painless flat feet are generally monitored, not treated.
- Orthoses help symptomatic adults; strengthening and footwear matter too.
- Pain, stiffness or a foot getting flatter over time should be assessed.
At Flow Clinic we assess whether a flat foot is actually contributing to your symptoms before recommending anything — and we won’t treat a foot shape that isn’t causing a problem.
Evidence & sources
Choi JY, et al. Foot orthoses for flexible flatfeet in children and adults: a systematic review and meta-analysis of patient-reported outcomes. BMC Musculoskeletal Disorders. 2022. link.springer.com/article/10.1186/s12891-022-06044-8
Dars S, et al. The effectiveness of non-surgical intervention (Foot Orthoses) for paediatric flexible pes planus: A systematic review. PLOS ONE. 2018. journals.plos.org/plosone/article?id=10.1371/journal.pone.0193060
This article is general information, not a substitute for individual assessment. See a qualified health professional for advice specific to you or your child.
Worried about flat feet?
Book an assessment at Flow Clinic in Wairau Valley for a clear answer on whether they need treatment.