Why is my Foot Getting Flatter?

If you’ve caught a glimpse of your foot lately and thought your arch looks lower than it once did, you’re not imagining it. A foot that gradually flattens over time is surprisingly common in adults and often signals that something beneath the surface has changed.

At Triad Foot & Ankle Center, one of the questions we hear most often is, “Why is my foot getting flatter?” The answer isn’t always simple. Your arch is supported by a delicate balance of tendons, ligaments, joints, and bone structure. When that balance shifts due to age, activity, strain, or injury, the architecture of the foot can begin to change.

In many cases, the culprit is dysfunction of the posterior tibial tendon, the key structure that helps hold the arch in place. Ligament laxity, arthritis, prior injuries, or years of cumulative wear can also weaken the support system of the foot. Over time, the arch loses stability and gradually collapses. This progressive condition is known as adult-acquired flatfoot, and early evaluation can make a significant difference in preventing further deformity and discomfort.

Common Causes of Adult-Acquired Flatfoot

• Posterior Tibial Tendon Dysfunction: The leading cause of arch collapse. When this key supporting tendon becomes inflamed or torn, it can no longer hold the arch in place, and the foot gradually flattens.
• Aging and Repetitive Stress: Over time, ligaments and tendons lose strength. Years of standing, walking, or impact can slowly lower the arch.
• Injury or Trauma: Past sprains, fractures, or tendon injuries can destabilize the foot, leading to gradual flattening.
• Arthritis and Joint Degeneration: Arthritis weakens the joints that support the arch, allowing it to progressively collapse.
• Weight Changes and Increased Load: Increased body weight or prolonged standing adds strain to the arch and can accelerate structural changes.

Can an Adult-Acquired Flatfoot Worsen Over Time?

Yes. Adult-acquired flatfoot is often progressive. Without treatment, the condition can worsen and lead to chronic pain, ankle arthritis, severe deformity, and loss of mobility. In advanced cases, surgical correction may become more complex.

Early diagnosis often allows for non-surgical treatment and better long-term outcomes. 

Adult-Acquired Flatfoot Treatment Options

Treatment is guided by the severity of the deformity, its flexibility, and the level of symptoms present. Options may include:
• Custom orthotics to support and realign the arch
• Ankle bracing to improve stability
• Physical therapy to strengthen supportive tendons and muscles
• Anti-inflammatory treatments to reduce pain and swelling
• Activity modifications to decrease strain on the foot
• Reconstructive procedures to restore alignment and function in more advanced cases

When Should I See a Podiatrist?

You should consider an evaluation if you notice:
• One foot is becoming noticeably flatter than the other
• New or increasing foot or ankle pain
• Swelling along the inside of the ankle
• Fatigue or difficulty standing and walking for long periods
• Shoes are worn unevenly
• A visible change in the shape or alignment of your foot

Flat feet without pain do not always require treatment. However, flattening that is accompanied by discomfort, weakness, or instability should be assessed early to prevent progression. If you would like to schedule an evaluation, please call (336) 375-6990, or click here to schedule an appointment.