Flat Feet in Adults: Fallen Arches, Symptoms and How Physio Helps

In short

Flat feet, also called fallen arches, means the inside arch of the foot sits low or touches the ground when you stand. Many adults have flat feet and never feel a thing. Others notice aching arches, tired ankles, sore knees or hips, or shoes that wear out unevenly. Flat feet only need treatment when they cause symptoms or when an arch drops suddenly in adulthood.

Physiotherapy treats flat feet by strengthening the muscles that support the arch, improving the way you walk and advising on footwear and load. FlexAura's HCPC-registered, DBS-checked physiotherapists assess and treat flat feet at home across the UK, or by online video consultation. This platform facilitates booking only. It does not provide medical advice.

What flat feet and fallen arches actually are

The arch of the foot is held up by bones, ligaments, the plantar fascia and a group of muscles, especially the tibialis posterior tendon that runs down the inside of the ankle. When these structures are long, weak or overloaded, the arch sits lower. Some people are born with a low arch. Others develop one later in life, which is often described as a fallen, dropped or collapsed arch.

The medical terms vary. Flat feet, pes planus, fallen arches, dropped arches and collapsed arches usually describe the same picture: a foot that looks flat when you stand on it. What matters more than the label is whether the arch is flexible or rigid, whether it hurts, and whether it changed recently.

Flexible or rigid flat feet: a quick check at home

Stand normally and look at your feet in a mirror, then rise up onto your toes. In a flexible flat foot the arch reappears when you stand on tiptoe or sit with your feet dangling. In a rigid flat foot the arch stays flat whatever you do. Flexible flat feet are far more common in adults and respond well to exercise-based physiotherapy. A rigid flat foot needs assessment before any exercise plan.

Type	What you see	Typical next step
Flexible flat foot	Arch appears on tiptoe or when sitting, flattens when standing	Strength and gait work with a physiotherapist, footwear advice
Rigid flat foot	Arch stays flat in every position, foot feels stiff	GP or physiotherapy assessment first, imaging if advised
Adult-acquired flat foot	One arch drops over months, pain on the inside of the ankle	Prompt assessment; often the tibialis posterior tendon

Why arches drop in adulthood

A childhood arch can hold up well for decades and then lower for a reason you can usually trace. The tibialis posterior tendon is the common culprit. It can become overloaded by weight gain, standing jobs, a sudden jump in walking or running, or simply years of use. As it weakens, the inside of the ankle aches and the arch flattens. Physiotherapists see this picture often, and it usually affects one foot more than the other.

• Tendon overload: the tibialis posterior tendon stretches and weakens, so the arch loses its main support.
• Injury: a past ankle sprain, fracture or ligament tear can change how the foot sits.
• Arthritis: inflammatory or wear-and-tear arthritis in the midfoot joints can let the arch settle.
• Pregnancy and hormones: ligaments loosen and body weight rises, which can lower both arches.
• Diabetes and nerve problems: reduced sensation can lead to changes in foot shape that need medical review.
• Tight calves and weak hips: both push the foot into a flatter, more rolled-in position with every step.

Symptoms that suggest your flat feet need attention

Flat feet that have never hurt rarely need treatment. The signs worth acting on are pain and change. Many adults first notice an ache along the inside of the foot or ankle after a long day on their feet, or tiredness in the calves and arches. Shoes may wear more on the inner edge. Ankles can look as though they roll inwards from behind. Some people develop knee, hip or lower back discomfort because the whole leg turns in when the arch drops.

Flat feet are often confused with plantar fasciitis because both cause arch pain. Plantar fasciitis is usually sharpest under the heel with the first steps of the morning, while a dropped arch tends to ache along the inside of the foot and ankle and worsen through the day. If arch pain is your main complaint, our guide to foot arch pain and how physio helps covers the full range of causes.

When to see a GP or get urgent help

Book a GP appointment if your flat feet are painful, stiff, weak or numb, if one arch has dropped recently or only on one side, if you keep injuring your feet or ankles, or if walking has become difficult. People with diabetes should have any change in foot shape checked promptly. Call 999 or see a GP urgently for sudden weakness or numbness, chest pain, loss of bladder or bowel control, or a suspected stroke. The NHS guidance on flat feet sets out when to seek help.

What helps flat feet at home

For flexible flat feet without red flags, sensible self-care makes a real difference. Choose shoes with a firm heel counter, a sole that does not twist easily and enough room across the forefoot. Supportive trainers are usually better than flat, flimsy shoes or worn-out slippers. Off-the-shelf arch supports help some people, particularly for long days of standing, but they work best alongside strengthening rather than instead of it.

Simple exercises build the muscles that hold the arch up. Try slow heel raises while holding a worktop, keeping the weight over the big toe rather than rolling outwards. Practise the "short foot" drill: sitting with your foot flat, draw the ball of the foot towards the heel to lift the arch without curling the toes. Stretch the calves daily with the heel down and the knee straight, then bent. Keep sessions gentle and stop if pain rises sharply or lingers.

UK Physio Tip: Film yourself walking away from the camera on your phone, barefoot and then in your usual shoes. If the heel and ankle visibly tip inwards on one side more than the other, that asymmetry is worth showing a physiotherapist. One-sided arch collapse in an adult deserves assessment sooner rather than later.

How physiotherapy helps flat feet and fallen arches

A physiotherapist does not try to force a new arch into a foot that has always been flat. The aim is a foot and leg that cope with your daily load without pain. Assessment starts with your story: when the arch changed, what hurts, your shoes, your job and your activity. The physio then looks at how you stand, walk, balance on one leg and rise onto your toes, and tests the strength of the tibialis posterior, calves and hips.

What a treatment plan usually includes

1. A targeted strength programme for the arch, calf and hip muscles, progressed as you get stronger.
2. Load management, so standing, walking or running stays within what the tendon can currently handle.
3. Footwear and insole advice matched to your foot and the shoes you actually wear.
4. Gait and balance retraining to reduce the inward roll that strains the knee and hip.
5. Hands-on techniques and taping where they help settle symptoms so you can exercise.
6. Clear criteria for referral to a GP or podiatrist if the foot needs further investigation.

Recovery varies by person and depends on how long the arch has been dropping and what caused it. Your physiotherapist will set realistic goals with you and review progress at each visit. If flat feet have led to a running or sports injury, our sports injury physiotherapy at home covers the return-to-activity side as well.

Flat feet physiotherapy at home or online with FlexAura

Many people with flat feet find clinic visits hard to fit in, especially with a standing job, young children or limited mobility. With physiotherapy at home, an HCPC-registered, DBS-checked physiotherapist comes to you anywhere in the UK. Every home visit, first visit and follow-up alike, lasts 60 minutes. The physio brings what the session needs, watches you walk on your own floors and stairs, and checks the shoes you really wear rather than the pair you brought to a clinic.

Online video consultations are also available and work well for flat feet. Your physiotherapist can watch you stand, walk and perform the tiptoe test on camera, then teach and progress your exercise programme from there. Online consultations last 30 minutes.

• Online consultation £45
• Home visit £110 first visit, £99 follow-up
• 5-session home package £450

Patients pay after the visit and there are no cancellation fees. Full details are on our pricing page. FlexAura is rated 5.0 on Google. To get started, Book a Physiotherapist online, call 07782 610 633 or WhatsApp us, and tell us a little about your feet so we can match you with the right physio.