Thickened nail

Thickened toenails are common in both children and adults. They can develop slowly or after an injury, and may become difficult to trim, uncomfortable in shoes, or painful if left untreated. A podiatrist can identify the cause, safely reduce the thickness, and help prevent complications.

What Causes Thickened Toenails?

1. Acute Trauma

Sudden injury can damage the nail’s growth centre (matrix), leading to permanent thickening.
Examples include:

• Dropping something heavy on the toe

• A horse stepping on the foot

• Stubbing the toe

• Sporting injuries

2. Repetitive Pressure or Overloading

Micro‑trauma over time can thicken the nail.
Common reasons:

• Poor gait or altered walking pattern

• Tight Achilles tendon, causing forward pressure in the shoe

• Toe deformities

• Long‑distance walking or running

• Wearing tight or narrow shoes

3. Tight Footwear

Constant pressure from narrow or shallow shoes can deform the nail and cause thickening.

4. Fungal Nail Infection (Onychomycosis)

Thickened nails can crack or lift, allowing fungus to enter.
Once infected, nails may become:

• Yellow or brown

• Brittle

• Crumbly

• Difficult to trim

5. Subungual Corn(painful)

A corn growing underneath the nail due to pressure or friction can push the nail upward, making it appear thick, painful, or distorted.
This often occurs when:

• Shoes press on the nail

• The toe rubs against the top of the shoe

• There is clawing or curling of the toes

6. Subungual Exostosis

A bony overgrowth at the tip of the toe (distal phalanx) can lift the nail from underneath.
This may cause:

• Nail thickening

• Pain when wearing shoes

• Nail deformity

• Pressure‑related irritation

7. Age‑Related Changes

As people age, nails naturally grow slower and thicker due to reduced circulation and long‑term micro‑trauma.

Why Thickened Nails Matter

Without proper care, thickened nails can:

• Become painful in shoes

• Crack or split, causing bleeding or infection

• Lift from the nail bed, increasing fungal risk

• Trap dirt and debris

• Make self‑care difficult

• Affect walking and balance, especially in older adults

How Podiatrists Can Help

• Safely reduce nail thickness using sterile instruments

• Make future nail trimming easier

• Improve comfort and shoe fit

• Identify whether trauma, pressure, fungus, or bone changes are the cause

• Treat subungual corns and manage pressure points

• Provide advice on footwear and gait mechanics

• Address underlying issues such as Achilles tightness or poor gait

Regular podiatry care prevents the nail from becoming painful or infected.

When to Seek Help

• Nail becomes too thick to trim

• Pain when wearing shoes

• Nail cracks, splits, or lifts

• Sudden change in nail shape or colour

• You suspect a fungal infection

• Difficulty managing nails due to age or mobility