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Anurag
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Anurag
Published Date25 Sept'26
Last Updated25 Sept'26
Read Time17 Minutes
About
Yes, flat feet can affect aspects of posture, balance and lower-limb mechanics in some people, but having flat feet does not automatically mean you have poor posture.
Your feet are the foundation on which your body stands and moves. When you stand or walk, your feet interact with the ankles, knees, hips and pelvis to help distribute forces and maintain balance. A low or flattened arch can be associated with differences in foot motion and lower-limb movement, but the relationship between flat feet and posture is complex and varies from person to person.
Research has found relationships between flat-foot posture and lower-limb kinematics, although the evidence is not strong enough to say that flat feet directly cause poor posture in everyone. A systematic review found evidence of a relationship between pes planus and increased lower-limb motion during walking, while also noting methodological limitations and relatively small effects.
So the short answer is:
Flat feet may influence posture and body mechanics, but flat feet alone do not prove that your posture is poor or that they are the cause of a particular posture problem.
Flat feet may influence posture through changes in the way the foot interacts with the ground during standing and movement.
A simplified chain looks like this:
Foot structure and function
↓
Foot and ankle movement
↓
Lower-leg mechanics
↓
Knee and hip movement
↓
Pelvic and whole-body positioning
↓
Postural adjustments
This does not mean that every person with flat feet follows this exact pattern.
The body is adaptable, and many people with flat feet have normal, comfortable movement without noticeable postural problems.
Research into foot posture and walking has found evidence that pes planus can be associated with increased lower-limb motion, but researchers have also noted that the evidence is not conclusive.
Flat feet, also called pes planus, are characterised by a relatively low or flattened medial longitudinal arch when the foot is bearing weight.
The appearance of a flat foot can vary considerably between individuals.
Some people have:
A naturally low arch
A flexible flat foot
A rigid flat foot
One flatter foot than the other
Flat feet without symptoms
Flat feet accompanied by foot or lower-limb discomfort
Therefore, a low-looking arch does not automatically mean that something is wrong.
For a broader explanation of foot structure, see:
What Are the Different Types of Foot Arches?
You can also learn how normal, low and high arches differ:
Normal Arch vs Low Arch vs High Arch: What's the Difference?
The connection is primarily related to foot mechanics and the way the lower limb adapts to movement and loading.
When you stand, your feet provide the base of support for your body. When you walk, the feet must repeatedly absorb and transfer forces while allowing the body to move forward.
Changes in foot posture can therefore be accompanied by changes in movement elsewhere.
A systematic review of foot posture and lower-limb kinematics found evidence of a relationship between pes planus and increased lower-limb motion during walking. However, the authors noted that the evidence was not conclusive because of methodological issues and small effect sizes.
This means it is more accurate to say:
Flat feet can be associated with changes in posture and movement in some people.
It is less accurate to say:
Flat feet always cause poor posture.
Flat feet may contribute to postural changes in some people, but they are not automatically the cause of poor posture.
Posture is influenced by many factors, including:
Foot and ankle mechanics
Hip mobility
Muscle strength
Balance
Previous injuries
Habitual movement patterns
Work environment
Sitting and standing habits
Physical activity
Individual anatomy
This is why simply looking at someone's feet is not enough to determine whether flat feet are responsible for their posture.
A person can have visibly flat feet and maintain comfortable, efficient posture.
Another person with similar-looking feet may develop different movement patterns.
Flat feet may influence lower-limb alignment and movement, particularly when differences in foot posture are accompanied by altered foot or ankle mechanics.
The foot does not operate in isolation.
During walking and standing, the body continually adjusts to maintain balance and movement efficiency.
Research examining foot posture and lower-limb kinematics has identified relationships between pes planus and lower-limb motion, although the magnitude and clinical importance of these relationships can vary.
Therefore, the relationship can be thought of as:
Foot → ankle → lower leg → knee → hip → pelvis → trunk
rather than:
Flat feet → bad posture
The first model better reflects the complexity of human movement.
They can influence standing mechanics in some individuals, but flat feet do not necessarily cause an abnormal standing posture.
When standing, your feet provide the base through which forces are transmitted to the ground.
People with flat feet may demonstrate differences in:
Foot contact
Pressure distribution
Foot position
Ankle position
Balance strategies
However, these differences do not necessarily produce symptoms or visibly poor posture.
A review examining foot orthoses and centre-of-pressure displacement found that evidence regarding changes in balance-related measures was inconsistent, although some studies reported reduced centre-of-pressure excursion in people with flat feet using orthoses.
More recent research has also investigated balance in people with flat feet and found that some orthotic designs can produce immediate improvements in static balance, although those effects were not consistently maintained with continued use.
Flat feet can be associated with changes in walking mechanics, which may influence movement throughout the lower limb.
Walking requires coordinated movement between the foot, ankle, knee, hip and trunk.
A systematic review found evidence that pes planus is associated with increased lower-limb motion during walking. However, the researchers cautioned that the available evidence was not conclusive.
More recent research continues to investigate gait changes in flexible flat feet, including differences in spatiotemporal and kinematic gait parameters.
This is why walking mechanics can be more informative than simply looking at whether an arch appears flat while standing.
Flat feet may be associated with differences in balance and postural control in some people.
Balance depends on information and control from several systems, including:
Feet
Ankles
Vision
Vestibular system
Proprioception
Muscles and joints
Nervous system
Because the feet provide the body's contact with the ground, changes in foot mechanics can potentially affect how a person manages balance.
Research on foot orthoses in people with flat feet has found some evidence of immediate improvements in static balance with certain orthotic designs, but longer-term effects remain less certain.
Therefore:
Flat feet do not automatically mean poor balance.
No. Flat feet and pronation are related but different concepts.
Flat feet
Usually describe foot structure or arch height.
Pronation
Describes a movement pattern of the foot.
Overpronation
Generally refers to excessive or poorly controlled pronation during movement.
A person can have a low arch without necessarily demonstrating excessive pronation.
This distinction is important when discussing posture because movement during walking may tell you more than the appearance of the arch alone.
For a detailed explanation, read:
Flat Feet and Overpronation: What's the Connection?
Overpronation may be associated with changes in lower-limb movement, but it should not automatically be described as the cause of poor posture.
Pronation occurs as part of normal foot movement.
The question is not simply whether someone pronates, but:
How much movement occurs?
When does it occur?
Is it symmetrical?
Does it affect movement elsewhere?
Is it associated with symptoms?
Does it limit function?
This is one reason why a static examination of foot shape may not tell the entire story.
Flat feet may be associated with changes in lower-limb mechanics that include movement around the knee, but knee alignment should not be inferred solely from arch height.
Research into foot posture and lower-limb kinematics has identified relationships between foot posture and movement of the lower limb during walking.
If the primary concern is knee pain rather than posture, see:
Can Flat Feet Cause Knee Pain?
That article addresses the flat feet → knee pain search intent separately.
Flat feet may be associated with changes in lower-limb mechanics that extend toward the hip, but this does not mean that every person with flat feet has abnormal hip alignment.
Walking involves coordinated movement across multiple joints.
A change in foot mechanics can potentially be accompanied by changes higher in the kinetic chain, but individual responses vary.
The important distinction is:
Association does not equal causation.
If someone has flat feet and hip symptoms, the entire lower limb should be considered rather than assuming that the arch is responsible.
Flat feet may influence movement patterns that involve the pelvis in some individuals, but evidence does not support the idea that flat feet automatically cause pelvic misalignment.
Pelvic position is affected by many factors, including:
Hip mobility
Muscle strength
Leg length
Movement habits
Previous injury
Foot and ankle mechanics
Individual anatomy
Therefore, claims that “flat feet cause pelvic tilt” should be treated cautiously unless they are supported by an individual assessment.
There is a possible biomechanical relationship between foot mechanics and movement higher up the body, but flat feet alone do not establish that the spine is misaligned.
The spine continuously adapts to the position and movement of the rest of the body.
However, spinal posture is influenced by many factors beyond the feet.
This is particularly important because your previous article addresses a different question:
Can Flat Feet Cause Back Pain?
They may contribute to asymmetrical movement in some individuals, but uneven posture has many possible causes.
Potential contributors include:
Differences between the two feet
Previous injuries
Hip or ankle mobility differences
Muscle weakness
Leg-length differences
Habitual standing positions
Balance strategies
Foot mechanics
If one foot appears significantly flatter than the other and you have persistent symptoms, professional assessment may be appropriate.
You cannot reliably determine this from arch height alone.
Instead, consider several factors.
1. Look at your arches
Observe your feet while:
Sitting
Standing
Walking
Some flexible flat feet show a visible arch when the foot is unloaded but flatten when weight is placed on the foot.
You can learn more about identifying your arch type here:
How to Tell What Type of Foot Arch You Have
2. Compare both feet
Look for obvious differences between the left and right foot.
3. Observe your standing position
Notice whether you consistently:
Shift weight to one side
Stand with one foot turned outward
Rely heavily on one leg
Experience discomfort during prolonged standing
These observations are not a diagnosis, but they can help identify patterns worth discussing with a professional.
4. Observe walking
Look for obvious differences in:
Foot placement
Step length
Foot rolling
Balance
Comfort
Again, visual observation alone cannot establish causation.
5. Consider symptoms
A low arch is more relevant when it is accompanied by:
Foot pain
Ankle discomfort
Recurrent lower-limb symptoms
Balance difficulties
Walking limitations
Changes in function
No.
This is one of the most important points to understand.
Many people have flat or low arches without experiencing pain or functional limitations.
Foot structure is only one component of posture.
Someone with flat feet may have:
Normal balance
Comfortable walking
Good movement control
No significant symptoms
Another person with a similar foot shape may have different functional characteristics.
Therefore, flat feet should not automatically be labelled as a posture problem.
Not necessarily.
Flat feet describe a characteristic of the foot. Body alignment is a much broader concept involving:
Feet
Ankles
Knees
Hips
Pelvis
Spine
Shoulders
Head
A person's overall alignment cannot be determined solely from their arch height.
This distinction is particularly important for online health content because statements such as “flat feet cause your whole body to become misaligned” are much stronger than the evidence supports.
They can be associated with differences in gait mechanics, particularly in people with flexible flat feet.
Recent systematic-review research has examined changes in spatiotemporal and kinematic gait parameters among people with flexible flat feet.
A separate systematic review found evidence of increased lower-limb motion associated with pes planus during walking, although the authors considered the evidence inconclusive because of methodological limitations and small effects.
This reinforces an important principle:
Foot shape can influence movement, but foot shape does not completely determine movement.
Two people can have similar-looking arches but move differently.
For example:
Person A
Low arches
No pain
Comfortable walking
Good balance
No functional limitation
Person B
Low arches
Pronated movement
Recurrent discomfort
Different gait pattern
Reduced tolerance for prolonged activity
Their foot structure may look similar, but their functional presentation is different.
This is why evaluating foot function can be more informative than simply asking whether someone's feet are flat.
No.
Arch height is only one measurement of the foot.
Other characteristics may include:
Rearfoot position
Forefoot position
Foot mobility
Pronation during movement
Ankle range of motion
Muscle strength
Balance
Gait mechanics
Research on foot posture and lower-limb kinematics supports looking beyond static foot appearance when studying movement.
Arch support can change aspects of foot and lower-limb mechanics, but it should not automatically be described as a way to “fix” posture.
Research published in 2024 found that foot orthoses affected several measures of walking mechanics in adults with flat feet, including rearfoot eversion, ankle dorsiflexion and certain ankle and knee moments.
However, changing biomechanics is not the same as correcting someone's entire posture.
A 2021 systematic review found insufficient high-quality evidence to draw firm conclusions about the effectiveness of foot orthoses for adults with flat feet.
More recent evidence suggests that particular orthotic designs can influence lower-limb mechanics, but effects vary according to the design and activity being studied.
For readers specifically interested in arch support, link to:
Do Flat Feet Need Arch Support?
How Does Arch Support Help Flat Feet?
Insoles or foot orthoses can influence foot and lower-limb mechanics, but their effect on overall posture depends on the individual and the specific design.
A 2024 systematic review and meta-analysis found that foot orthoses altered several lower-limb joint angles and moments during walking in adults with flat feet.
However, this does not mean that any insole will improve posture.
A 2025 systematic review and meta-analysis in runners with asymptomatic flat feet found that orthoses with specific medial posts produced some biomechanical changes, whereas arch-support-only designs did not consistently demonstrate the same effects.
Therefore, “insole for flat feet” and “insole to correct posture” should not be treated as interchangeable concepts.
For the dedicated insole topic:
Exercise may be useful when a person's posture or movement is affected by limitations in strength, mobility, balance or motor control.
Depending on the individual, a professional may consider exercises involving:
Foot and ankle strength
Strengthening the muscles that control the foot and ankle may improve functional control.
Calf mobility
Limited ankle mobility can influence how the lower limb moves during activities such as walking and squatting.
Hip strength
The hips play an important role in lower-limb movement and stability.
Core and trunk control
Postural control is not determined by the feet alone.
Balance exercises
Balance training may help address deficits in postural control where appropriate.
However, there is no universal exercise routine that can be described as “the exercise to fix flat-foot posture.”
The appropriate exercise strategy depends on the individual's movement pattern and symptoms.
Not necessarily.
If your flat feet are comfortable and do not interfere with normal activity, the presence of a low arch does not automatically mean that it needs to be corrected.
Treatment or support may be considered when flat feet are associated with:
Pain
Reduced function
Balance difficulties
Walking limitations
Recurrent symptoms
Progressive changes
Problems during specific activities
The goal should generally be better function and comfort, rather than trying to force every foot into the same visual shape.
The scientific evidence is more nuanced than many online claims suggest.
Research supports a relationship with lower-limb mechanics
A systematic review found evidence of a relationship between pes planus and increased lower-limb motion during walking. However, the authors noted that the evidence was not conclusive because of methodological limitations and small effect sizes.
Research also shows that gait can differ in flexible flat feet
A recent systematic review and meta-analysis examined spatiotemporal and kinematic gait changes associated with flexible flat feet, demonstrating continued research interest in how flat-foot structure relates to movement.
Orthoses can alter biomechanics
A 2024 systematic review and meta-analysis found that foot orthoses can influence several lower-limb joint angles and moments during walking in adults with flat feet.
But orthoses should not be marketed as automatic posture correction
A systematic review of adult flatfoot orthoses found that the evidence base was limited and heterogeneous, making firm conclusions difficult.
The evidence therefore supports a relationship between foot mechanics and movement, but not the simplistic conclusion that:
“Flat feet cause bad posture and arch supports will fix it.”
Consider an assessment if you have:
Persistent foot pain
Persistent ankle or lower-limb pain
Significant balance difficulties
Difficulty walking or exercising
A newly developed flat foot
One foot becoming noticeably flatter than the other
Progressive changes in foot shape
Symptoms that interfere with daily activities
Recurrent lower-limb problems
A healthcare professional can assess the foot together with the ankle, knee, hip and movement pattern rather than judging the issue from arch height alone.
Yes, flat feet can affect aspects of posture, balance and lower-limb mechanics in some people, but flat feet do not automatically cause poor posture.
The strongest way to understand the relationship is to distinguish foot structure from foot function.
A low arch may be associated with changes in foot movement and lower-limb kinematics, and research has found relationships between pes planus and lower-limb movement during walking. However, the evidence is not strong enough to say that everyone with flat feet develops poor posture.
The practical takeaway is:
Flat feet → may influence foot mechanics → may influence lower-limb movement → may contribute to postural adaptations in some people.
But:
Flat feet ≠ automatically poor posture.
If you have symptoms, the more useful question is not simply “Are my feet flat?”, but “How are my feet functioning, and are they contributing to my movement or symptoms?”
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