Medical Oncologist
Skin side effects
Nail changes during chemotherapy
Chemotherapy slows the fast-growing cells at the base of the nail, so ridges, dark bands, white lines, brittleness or loosening can appear. In the great majority of patients these changes are harmless and grow out with the nail over months. What needs prompt attention is redness, pus or throbbing in the skin around a nail.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
Why do nails change during chemotherapy?
Nails grow from a small area of fast-dividing cells at their base, and chemotherapy slows or interrupts that growth with each cycle. The result can be horizontal ridges or grooves across the nail, dark bands or a general darkening, brittleness, splitting, white lines, or a nail that becomes loose. The changes look alarming and are, in the great majority of patients, harmless and temporary.
They grow out slowly with the nail. Fingernails take several months to replace themselves and toenails considerably longer, so changes often remain visible well after the last cycle. A ridge for each cycle is common enough that some patients can count their treatments across a nail.
Keep them short and clean
Short nails catch less, split less and hide less dirt. Trim straight across with clean clippers, and file rough edges gently.
Watch the skin around the nail
The nail itself changing is usually harmless. Redness, swelling, pain or pus in the skin around it can be an infection, which matters when counts are low.
Avoid manicures and pedicures during treatment
Cutting cuticles and using shared salon tools create small wounds and introduce infection. Leave cuticles alone until treatment is over.
Ask whether your drugs are known to affect the nails, and whether cooling gloves are offered with them.What you may see
The common nail changes and what they mean
- Horizontal ridges or grooves
- Lines running across the nail from side to side, often one for each cycle, where growth paused. Harmless, and they move towards the tip as the nail grows.
- Dark bands or darkening
- Brown, grey or black bands across or along the nail, or a general darkening, especially common on brown skin with certain drugs. Usually fades as the nail grows out.
- White lines or patches
- White bands across the nail, sometimes in pairs, related to growth changes during treatment. Harmless and grow out.
- Brittle, thin or splitting nails
- Nails that break, peel in layers or split at the tip. Moisturising the nails and keeping them short reduces snagging and pain.
- Nail loosening
- The nail starts to separate from the bed, usually at the tip. Uncommon, more likely with some drugs, and needs gentle care to avoid infection.
- Soreness or tenderness of the nail bed
- Aching fingertips or toes, sometimes with swelling. Report it, particularly if it comes with redness or pus.
Not sure whether this applies to you?
Ask an oncologistPractical
Looking after nails during treatment
Protect them, keep them simple, and watch the skin around them.
Trim short, straight across
Clean clippers kept for the patient only, trimming straight across rather than into the corners, which reduces ingrown nails and infection.
Avoid
- Cutting or pushing back cuticles
- Biting or picking at nails
Moisturise nails and cuticles
Rub a little plain moisturiser into the nails and the skin around them every evening. It reduces brittleness and cracking of the nail folds.
Protect the hands
Cotton-lined rubber gloves for washing vessels, cleaning and gardening, and avoid soaking hands in water for long periods, which softens and weakens nails.
Hand over
- Scrubbing vessels
- Hand washing clothes
Choose roomy footwear
Shoes and chappals that do not press on the toenails, with clean cotton socks. Tight shoes and long walks can loosen toenails that are already affected.
Skip polish removers and false nails
Acetone removers dry nails badly, and false nails or gel extensions trap moisture and infection. If you want colour, ask your team first and use a gentle, acetone-free remover.
!
Contact your team the same day for any of these
Redness, swelling, heat or throbbing pain in the skin around a nail · pus or discharge from a nail fold or from under a nail · a nail lifting with pain, bleeding or oozing underneath · red streaks spreading up a finger or toe · a fever at or above your team's threshold, which needs the nearest emergency department immediately. A nail infection during the low-count days can become a serious infection, so do not wait for the next appointment.
Being straight with you
What this page cannot tell you
It cannot tell you whether a particular change on your nail is the drug effect or something else. Most are the expected effect, but a single dark streak running lengthways that widens, or a change that bleeds or forms a lump, should be examined rather than assumed to be treatment.
It also cannot tell you exactly how long your nails will take to recover. That depends on how fast your nails grow, which drugs you had and for how long, and whether the nail bed itself was affected. Fingernails usually recover sooner than toenails.
Nail changes do not mean treatment is failing
They are a sign that the drugs are affecting fast-growing cells, which is how they work. They say nothing, on their own, about how the cancer is responding.
Cooling during some infusions may help
For certain drugs, some units offer frozen gloves or socks during the infusion to reduce nail damage. It is not suitable for everybody. Ask whether it applies to your treatment.
Infection is the part that matters
A nail infection during low counts can spread. Redness, pus or throbbing around a nail should be reported the same day rather than treated with home remedies or shop creams.
Diabetes needs extra foot care
Patients with diabetes may not feel a toenail problem early and heal more slowly. Check the feet daily and mention any nail change on the toes at your next contact.
What to do next
Keep nails short and clean, moisturise the nails and cuticles each evening, and protect the hands with gloves for wet work. Leave cuticles alone, avoid salons and false nails, and wear roomy footwear. Report any redness, pus or throbbing around a nail the same day.
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Commonly believed
Four worries about changing nails
"Black nails mean the chemotherapy is poisoning me."
Darkening and bands are a known, harmless effect of some drugs on the growing nail. They do not mean poisoning or organ damage, and they grow out over months.
"A manicure will make the nails look normal again."
Cutting cuticles and shared salon tools create small wounds and carry infection. Keep nails short and simple until treatment is finished.
"The ridges mean my nails are permanently damaged."
Ridges mark where growth paused during each cycle. They move towards the tip and are trimmed away as the nail grows.
"A red, sore nail fold will settle on its own."
During treatment it can be an infection that spreads when counts are low. Report redness, pus or throbbing the same day.
Questions we are asked
Common questions about nail changes
Why are there lines across my nails?
Horizontal ridges mark where nail growth slowed during a cycle, often one line per cycle. They are harmless and move towards the tip as the nail grows, then get trimmed away over the following months.
Why have my nails gone dark?
Several drugs increase pigment in the nail, especially on brown skin. It is harmless and fades as the nail grows out, though a single lengthways streak that widens should be examined by your team.
How long until my nails are normal?
Fingernails usually replace themselves over several months after treatment, and toenails take considerably longer. Changes can stay visible well after the last cycle, fading gradually as the nail grows.
Can I paint my nails?
Ask your team first. If they agree, use a gentle polish and an acetone-free remover, and avoid false nails and gel extensions, which trap moisture and can hide or cause infection.
My nail is lifting. What should I do?
Keep it short and clean, do not pull it off, and protect it with a light dressing if it catches. Tell your team the same day if there is pain, bleeding, pus or redness around it.
Is a sore nail fold an infection?
It can be. Redness, swelling, heat, throbbing or pus around a nail during treatment should be reported the same day, because infection can spread when counts are low.
Do cooling gloves help?
With certain drugs, some units offer frozen gloves or socks during the infusion to reduce nail damage. It is not suitable for everybody, so ask your team whether it applies to you.
Should I take biotin or calcium for my nails?
Ask your team before taking any supplement. Good evidence that they help during chemotherapy is lacking, and some supplements interfere with blood tests or interact with treatment.
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Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
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MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Sources
- American Cancer Society — Skin Problems
- Macmillan Cancer Support — Skin changes
- National Cancer Institute — Chemotherapy and You: Support for People With Cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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