A toenail that suddenly seems to be growing sideways can be surprising, especially when the other nails look normal. In many cases, the change reflects something affecting how that particular nail grows, such as repeated shoe pressure, an old injury, or changes around the nail matrix where new nail is produced. Infection can also alter a nail’s shape and direction.
The appearance alone usually isn’t enough to identify the cause. Paying attention to whether the nail is thickened, discolored, painful, lifting, or irritating the surrounding skin can provide useful clues. If the change is new, worsening, uncomfortable, or difficult to explain, a dermatologist can evaluate the nail and help determine what may be contributing to it.
Quick answer
- One toenail may grow at an angle because its growth pattern has been altered by pressure, trauma, or changes involving the nail-producing tissue.
- Tight or narrow shoes can repeatedly push against a toenail and may contribute to distorted growth over time.
- A previous toe injury can sometimes affect how a replacement nail grows, even after the original injury is no longer obvious.
- Fungal infection can make a toenail thicker, discolored, brittle, or misshapen, so an unusual growth direction is worth evaluating when those changes are also present.
- Pain, redness, swelling, drainage, bleeding, or difficulty walking are good reasons to seek professional evaluation.
What does sideways toenail growth mean?
The visible toenail is produced by tissue near its base called the nail matrix. If the nail plate is being formed or guided unevenly, it may gradually emerge at an angle rather than extending straight toward the end of the toe.
This can involve the nail itself, the surrounding skin, the shape of the toe, or repeated outside pressure. Because toenails grow slowly, a change you notice today may reflect something that affected the area well before the sideways growth became obvious.
Common reasons one toenail may grow sideways
- Repeated shoe pressure: Footwear that crowds a particular toe can place ongoing pressure on the nail and surrounding tissue.
- Previous trauma: Stubbing the toe, dropping something on it, sports-related impact, or repeated friction can disturb normal nail growth.
- Natural nail or toe shape: Some people have a nail that has grown at an angle for many years because of the underlying anatomy or growth direction.
- Changes around the nail matrix: Damage or irritation near the base of the nail can affect the way new nail forms.
- Fungal infection: Nail fungus may cause thickening, discoloration, brittleness, separation from the nail bed, and changes in nail shape.
- Pressure from surrounding skin: If the edge of the nail repeatedly pushes into nearby skin, irritation can make the problem more noticeable and uncomfortable.
Could it be toenail fungus?
It could be, but sideways growth by itself does not establish a fungal infection. Nail fungus can change a toenail’s color, thickness, texture, and shape. Cleveland Clinic notes that fungal nail changes may include discoloration, cracking, thickening, misshapen growth, and separation from the nail bed. Mayo Clinic similarly describes infected nails as potentially thickened, brittle, ragged, discolored, misshapen, or lifted from the nail bed.
Several noninfectious nail problems can look similar, which is why treating an unusual nail as fungus based only on appearance may miss the actual cause. A clinician may examine the nail and, when appropriate, obtain a nail sample before recommending prescription treatment.
What can you do at home?
Simple steps may reduce ongoing pressure and irritation while you monitor the nail:
- Choose shoes with enough room around the toes rather than footwear that compresses the affected nail.
- Trim the nail carefully and generally straight across instead of aggressively cutting into the corners.
- Keep the feet and nails clean and dry.
- Avoid repeatedly picking, digging under, or trying to force the nail into a different direction.
- Pay attention to changes in color, thickness, tenderness, surrounding redness, or drainage.
If the nail is very thick, painful, unusually shaped, or difficult to trim safely, professional evaluation may be more appropriate than attempting extensive trimming at home.
What can a dermatologist do?
A dermatologist can examine the nail, surrounding skin, and growth pattern to look for signs of trauma, infection, inflammation, or another nail disorder. If fungus is a possibility, testing may sometimes be used to help distinguish infection from other causes of nail distortion.
Management depends on what is found. Common approaches may include reducing mechanical pressure, improving nail-care habits, addressing an underlying infection when confirmed, or discussing other medical or procedural options when a structural nail problem is causing persistent symptoms. Your clinician can help you decide which approach makes sense for the specific nail change.
When should you see a dermatologist?
Consider having the nail evaluated if the sideways growth is new, keeps worsening, or has no clear explanation. It is especially worth getting checked if you notice:
- Pain or increasing tenderness
- Redness or swelling around the nail
- Pus or other drainage
- Bleeding
- Significant thickening or crumbling
- Yellow, white, brown, green, or black discoloration
- The nail lifting away from the nail bed
- Difficulty wearing shoes or walking comfortably
- A persistent change after an injury
People with diabetes, circulation problems, or a weakened immune system should be particularly cautious about new nail or foot problems and discuss them with an appropriate healthcare professional.
Frequently asked questions
Can tight shoes make a toenail grow crooked?
Repeated pressure from narrow or poorly fitting footwear may contribute to altered nail growth or irritation, particularly when the same toe is consistently compressed. Switching to shoes with more toe room can reduce continued pressure.
Can an old toe injury change nail growth?
Yes. An injury involving the nail or the tissue that produces it may affect how the replacement nail grows. Because toenails grow slowly, the resulting change can remain visible for a considerable period.
Should I try to straighten the toenail myself?
It is generally better not to dig into the nail edges or force the nail into a different position. Gentle trimming, roomy footwear, and avoiding additional trauma are safer conservative measures while you determine whether professional evaluation is needed.
Does a crooked toenail automatically mean fungus?
No. Fungal infection is one possible explanation for a misshapen toenail, but pressure, trauma, and structural growth differences can also change a nail’s appearance. Thickening, discoloration, crumbling, or lifting may make fungal infection more suspicious, but a clinician can evaluate the cause more accurately.
Why is only one toenail affected?
A single nail may be exposed to a local factor that does not affect the others, such as repeated pressure, a previous injury, or a change involving that nail’s growth area. Infection can also begin in one nail, so associated texture and color changes are worth noting.
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This article is for educational purposes and is not medical advice. For diagnosis and personalized treatment, please book an appointment with a board-certified dermatologist.
