Nails that peel in layers, split before they grow, or have developed vertical ridges. Most of it is ordinary and manageable with handling changes rather than products. A small number of nail findings genuinely matter, and one of them should always be shown to a doctor.

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The one to never ignore

A new dark or pigmented streak running lengthwise under a nail should be shown to a clinician. It is usually benign, and it can be melanoma of the nail unit — which is diagnosed late more often than skin melanoma because people assume it is a bruise.

Particularly if it is: widening, on the thumb or big toe, a single nail, irregular in colour, or if the pigment extends onto the surrounding skin.

This applies to all skin tones, and nail melanoma is proportionally more common in people with darker skin. See checking your own skin in midlife.

What is normal ageing

Vertical ridges — lines running from cuticle to tip. Extremely common with age, essentially universal eventually, and not a sign of deficiency despite what supplement marketing suggests.

Slower growth, and thinner, more brittle nails.

Slight yellowing or thickening, particularly toenails.

What changes around menopause

Nails are made of keratin, like hair and the outer layer of skin, and the same general dryness and slower turnover applies:

  • Drier nail plate and cuticle, so splitting and peeling increase — see menopause skin changes
  • Slower growth, so damage stays visible longer
  • The nail fold gets drier, so hangnails and cracking around the edges become more common

Findings worth investigating

Spoon-shaped nails (koilonychia) — the nail curves upward at the edges, sometimes enough to hold a drop of water. Classically associated with iron deficiency, which is very common with heavy perimenopausal bleeding. Ask for ferritin — see low ferritin in perimenopause.

Horizontal grooves across the nail (Beau's lines) — a pause in growth from illness, high fever, chemotherapy, or a period of severe stress. They grow out.

Sudden brittleness with other symptoms — thyroid disease affects nails, alongside hair, skin and temperature; see perimenopause versus thyroid.

Nail separating from the bed (onycholysis) — a white or yellow area lifting from the tip. Causes include trauma, thyroid disease, psoriasis, fungal infection, and some medications.

Pitting, or oil-drop discolouration — often psoriasis, which can affect nails before skin.

Clubbing — nails curving over rounded fingertips, developing over months. Needs assessment.

Persistent thickened, crumbling, discoloured toenails — usually fungal, and worth confirming with a sample before treating, because treatment is long and other conditions look similar. Anyone with diabetes should have foot and nail problems reviewed rather than self-treated; see menopause with diabetes.

A red or swollen, painful nail fold, particularly with pus — infection, and needs seeing.

What actually helps brittle nails

The evidence is thin across the board, and the handling changes matter more than anything you apply.

Reduce water and detergent exposure. Repeated wetting and drying is the main cause of splitting and peeling. Wear gloves for washing up and cleaning — this single change does more than any treatment.

Moisturise the nails and cuticles, not just hands, and do it after every wash. Any hand cream works; a thicker ointment at night works better.

Keep them short. Long nails lever and split. Shorter nails are less damaged and look better than broken long ones.

File in one direction with a fine file rather than sawing back and forth.

Do not push cuticles back hard or cut them. The cuticle seals the nail unit; damaging it causes ridging and infection.

Avoid acetone removers where you can, and give nails breaks between gel or acrylic manicures — repeated gel removal thins the nail plate substantially, and this is a common cause of the brittleness people blame on hormones.

Nail hardeners containing formaldehyde make nails more brittle over time rather than less, despite the name.

A plain cuticle oil used nightly is the cheapest thing that reliably helps, and it works by the same mechanism as everything else — reducing water loss.

Supplements

Biotin is the one always suggested. The evidence for brittle nails is limited and comes largely from small, old studies; guidance does not support routine use, and deficiency is rare.

More importantly: high-dose biotin interferes with laboratory tests, including thyroid function and cardiac troponin assays. That has produced misdiagnoses. Stop it several days before blood tests and tell whoever is testing you — see reading your own blood test results.

"Hair, skin and nails" formulas are generally multivitamins at a markup, often containing high-dose biotin — see how to tell whether a supplement is worth buying.

Where supplementation genuinely helps is correcting a confirmed deficiency — iron, and occasionally others. Test rather than guess, and do not take iron without a confirmed deficiency.

Protein matters, since nails are protein, and shortfall is common in this age group — see how much protein you need.

Does HRT help?

There is no established evidence that hormone therapy improves nails, and it should not be started for it. Some women report improvement alongside skin and hair changes, and it is not an indication — see HRT risks and benefits.

The short version

Gloves, short nails, oil at night, and fewer gel manicures. Then check ferritin and thyroid if the change is sudden or comes with fatigue.

And show anyone a new dark streak under a nail.

The free 2-minute Menova self-check organizes your wider symptom picture — no account, not a diagnosis, and your answers never leave your device.

This article is general education, not medical advice or a diagnosis. A new pigmented streak under a nail, nail separation, or a painful infected nail fold should be examined by a licensed clinician. Do not supplement iron without a confirmed deficiency.

Sources: American Academy of Dermatology — Nail Care, NIAMS — Skin Diseases, National Cancer Institute — Skin Cancer, and The Menopause Society.