As a sports PT, I commonly see ankle, foot, and arch pain associated with flat feet. Because flat feet are largely genetic, many people assume there’s little they can do about them. In reality, athletes can build strength and control through targeted exercises that help compensate for flat feet.
The issue usually comes down to how the foot and ankle handle load. When the arch collapses excessively during walking, running, jumping, or sports, it increases stress on the surrounding muscles and tissues. This collapse not only strains the arch itself but can also cause the ankle to rotate inward, contributing to pain in different areas of the foot and ankle. It may also affect knee and hip alignment during single-leg movements, increasing stress throughout the kinetic chain and raising injury risk in the knees, hips, and lower back.
The good news? While flat feet themselves can’t be genetically changed, improving ankle strength, movement control, and single-leg stability can significantly reduce symptoms and improve function.
Rather than relying only on arch supports or avoiding activity, the focus should be on building a stronger, more resilient foot and ankle.
Why Flat Feet Can Cause Ankle Pain
The term “flat feet” refers to increased flexibility or looseness in the foot arch (called laxity), which means the arch sits lower or collapses more during weight-bearing activities. This can change how forces are absorbed and transferred through the foot, ankle, and lower leg.
Common issues and symptoms that can occur include:
- Plantar fasciitis and shin splints
- Calf muscle injuries
- A change in single-leg movement patterns that can cause ankle, knee, hip, or back pain
- Difficulty creating force efficiently during sports and exercise
- Greater fatigue with prolonged activity
- Pain on the inside of the ankle or arch
Symptoms often develop gradually rather than from one specific injury.
When Are Flat Feet a Concern?
Having flat feet alone is not necessarily a problem. Many athletes with flat feet have no pain or limitations at all. Flat feet become more of a concern when the foot and ankle cannot maintain control during movement, leading to excessive collapsing through the foot, ankle, or knee.
A few simple movement screens can help identify whether the foot and ankle are handling load effectively:
- Single-leg balance: Stand on one leg with hands on hips for 20 seconds and compare both sides. Watch for excessive ankle collapse or loss of stability.
- Dynamic single-leg balance: Stand on one leg and reach toward the ground in different directions while maintaining good foot and ankle position.
- Double-leg long jumps: Jump forward and backward while maintaining good lower-body alignment during takeoff and landing.
- Single-leg hopping: Hop forward, backward, and side-to-side while controlling excessive movement through the foot and ankle.
Flat feet may become a concern when you consistently notice ankle or knee collapse during activities such as:
- Single-leg balance
- Dynamic reaching tasks
- Jumping and landing
- Single-leg running or hopping activities
The key issue is usually not the shape of the arch itself—it is whether the body can control movement effectively under increasing demands.
How Do You Address It?
The goal is not simply to change the appearance of the foot arch. The goal is to improve strength, control, and stability so the foot can manage greater levels of activity.
Start by identifying the point at which your foot and ankle begin to lose position or control during movement. This becomes your starting point for training. Exercises should challenge your body awareness and strengthen the muscles responsible for maintaining good foot and ankle mechanics.
As movement quality improves, gradually progress to more demanding activities until you can maintain good foot and ankle position during higher-level movements such as single-leg running and cutting in different directions.
If single-leg balance is currently too difficult, begin with simpler exercises:
- Arch lifts on two feet: Practice gently lifting and controlling the arch while holding onto a wall or stable surface for balance.
- Assisted single-leg balance: Stand on one leg while lightly holding onto a wall, chair, or support, focusing on maintaining foot and ankle stability.
Progressing gradually allows the foot and ankle to build strength and control without jumping too quickly into movements that are beyond your current ability level.
Strong Feet Support Strong Movement
Flat feet are not automatically a problem. In many cases, ankle pain develops because the muscles supporting the foot and ankle are being asked to do more than they can currently tolerate.
The goal isn’t necessarily to create a higher arch—it is to build stronger, more capable movement patterns.
By improving ankle strength, training ankle inversions, and building single-leg control, you can often reduce pain and return to activity with better stability and confidence.
The goal isn’t just getting rid of symptoms—it’s creating an ankle that can tolerate the demands you place on it.