Why Is My Toenail Growing at an Angle? 7 Causes & Fixes

A toenail growing at an angle — whether it curves sideways, grows crooked into the skin, or arcs downward — is almost always caused by pressure from tight footwear, improper trimming, or structural factors like toe injury or a genetic nail shape. Most cases are manageable at home, though ingrown toenails that become infected need professional treatment.

Why Is My Toenail Growing Crooked or Curved?

Toenail growth direction is determined by the nail matrix (the growth cells beneath the base of the nail) and the surrounding structures. When pressure, injury, or improper trimming distorts these structures repeatedly, the nail grows at an angle instead of straight ahead.

Your toenail grows from the nail matrix — a specialized region of cells under the base of the nail (the lunula). These cells divide and push the nail forward at a steady rate of roughly 1–1.5 mm per month for toenails. When the nail plate is repeatedly compressed from the side (by tight shoes), trimmed in a curved pattern (leaving sharp corners), or if the underlying bone or nail bed is damaged, the matrix produces cells that push the nail in the wrong direction.

The American Podiatric Medical Association estimates that ingrown toenails — a specific type of angled growth where the nail digs into the surrounding flesh — affect approximately 2.5% of the general population at any given time.

"Ingrown toenails occur most commonly in the big toe and are caused by improperly trimmed nails, tight footwear, or curved nail structure. The nail grows into the soft tissue of the nail groove, causing pain, swelling, and, if infected, drainage." — American Podiatric Medical Association at apma.org

7 Reasons Your Toenail Is Growing at an Angle, Crooked, or Curved

These seven causes cover the full range of toenail angle and curvature problems — from the most correctable to the most structurally fixed.

Are Your Shoes Too Narrow or Too Tight?

Tight footwear is the most common cause of toenails growing crooked or curving into the skin. Shoes that compress the forefoot — especially pointed-toe styles, high heels, or athletic shoes that are too short — push the toes together and redirect pressure onto the nail plate repeatedly with every step. Over time, this redirects nail growth toward the soft tissue at the nail edges.

Fix: Switch to shoes with a wide toe box that allow your toes to sit naturally without compression. Athletic shoes should have a thumb's width of space between the longest toe and the shoe tip.

Are You Trimming Your Toenails the Wrong Way?

Cutting toenails in a curved arc — following the shape of the toe tip — leaves pointed corners that dig into the surrounding nail groove as the nail grows. This is one of the most consistent causes of ingrown toenails and off-angle growth.

Correct trimming technique: Use toenail clippers (not scissors), cut straight across, and leave the corners slightly visible. Do not cut below the point where the nail separates from the nail bed. Trim to the level of the toe tip — not shorter.

Was There a Previous Toe Injury?

Trauma to the nail matrix — stubbing the toe hard, dropping something on it, or wearing shoes that cause repeated microtrauma (as in running) — can damage the matrix cells in a way that causes permanent or prolonged altered growth direction. Black toenails from subungual hematoma (blood under the nail) often grow back slightly curved or thickened because the matrix was disrupted.

Also Read: Why Is My Big Toe So Big? 7 Causes & What to Do

Is the Nail Plate Naturally Curved or Pincer-Shaped?

Some toenails have a genetic tendency toward a highly curved profile. A pincer nail (involuted nail) curves downward at the sides, narrowing the nail plate so dramatically that it can press into the nail bed. This shape is often hereditary and tends to become more pronounced with age. Mild cases are managed with correct trimming; severe cases can be surgically corrected by a podiatrist using a matrixectomy procedure (removing a portion of the nail matrix to permanently narrow the nail).

Could Fungal Infection Be Changing the Nail's Shape?

Onychomycosis — fungal nail infection — affects roughly 10% of the US population and is the most common cause of thickened, discolored, and crumbly toenails. A fungal infection does not directly cause angular growth, but it thickens and distorts the nail plate, making it harder and more likely to grow in an irregular direction. Affected nails are typically yellow, white, or brown, thickened, and often separate partially from the nail bed.

Also Read: Why Is My Toenail Purple? 7 Causes & When to Worry

Is There Underlying Bone or Joint Deformity?

A bunion (hallux valgus), hammer toe, or arthritic changes in the toe joints alter the alignment of the toe itself, which in turn changes the direction of pressure on the nail matrix. When the toe itself points inward (bunion) or curls downward (hammer toe), the nail grows toward the distorted soft tissue. Treating the underlying deformity may be necessary to achieve lasting improvement in nail angle.

Is the Skin Around the Nail Overgrown?

In some people — particularly older adults and those who do not trim regularly — the skin folds at the nail edges (the lateral nail folds) grow partially over the nail plate. This creates a physical barrier that redirects the nail sideways as it grows. Regular, correct trimming prevents this from developing and a podiatrist can trim back overgrown nail folds if they have already encroached on the nail.

"Onychomycosis is the most common nail disorder in adults and accounts for about half of all nail disease cases. It causes thickening, discoloration, and structural changes to the nail plate that alter the way the nail grows and sits on the nail bed." — American Academy of Dermatology Association at aad.org

At-Home Care vs. When to See a Podiatrist

In Short

Toenails grow at an angle because of tight shoes, incorrect trimming, previous injury, or a naturally curved nail shape. The most impactful change you can make immediately is switching to wide-toe-box footwear and trimming straight across. Ingrown toenails that become red, swollen, or start to drain need professional treatment — home cutting an infected ingrown toenail typically makes it worse.

What You Also May Want To Know

Why is my toenail growing crooked after it fell off?

When a toenail falls off after trauma or fungal infection, the new nail regrows from the matrix. If the matrix was damaged, the replacement nail often grows thicker, curved, or off-angle. Give the nail a full 6–12 months to fully regrow and normalize before considering treatment. Protecting the exposed nail bed with a bandage during regrowth prevents further matrix damage.

Why is my toenail curved under at the edges?

A toenail that curves sharply downward at both edges is called a pincer nail or involuted nail. It is usually genetic and tends to worsen with age as the nail matrix produces an increasingly narrow arc. Mild pincer nails can be managed with careful trimming and correct footwear; severe cases where the nail is pressing painfully into the nail bed benefit from a podiatrist procedure to permanently correct the growth arc.

Can I fix a curved toenail at home without surgery?

For mild curvature without infection, consistent correct trimming (straight across), proper footwear, and sometimes taping the nail edge away from the skin is sufficient. Nail braces — thin metal or fiber-composite strips bonded to the nail surface — are a non-surgical option that gradually flattens the nail's curve over weeks to months. These are available from podiatrists and increasingly through online specialty retailers.

How long does it take for a toenail to grow back straight?

Toenails grow at roughly 1–1.5 mm per month, meaning a full toenail regrowth takes 12–18 months. Correcting the nail direction through trimming and footwear changes shows gradual improvement over the same timescale — do not expect a straight nail within weeks of changing your shoes or trimming technique.

Reviewed and Updated on June 5, 2026 by George Wright