Brittle or fragile nails can have many causes. Sometimes they’re simply due to frequent exposure to water, soaps, or nail products, but they can also be a clue to underlying health issues.
Common causes of brittle nails
1. Repeated wetting and drying
Frequent handwashing, dishwashing, swimming, or exposure to cleaning products can strip moisture from nails, making them split or peel.
2. Aging
Nails naturally become drier and more brittle with age.
3. Nutritional deficiencies
Brittle nails can sometimes be associated with deficiencies in:
- Iron
- Zinc
- Protein
- B vitamins (especially biotin in some cases)
Iron deficiency may also cause spoon-shaped nails (a condition called Koilonychia).
4. Thyroid problems
Both underactive and overactive thyroid disorders can affect nail growth and strength. In particular, Hypothyroidism may cause dry, brittle nails.
5. Skin conditions
Conditions such as:
- Psoriasis
- Eczema
can affect the nails, leading to brittleness, pitting, or nail separation.
6. Fungal infections
A nail fungal infection, known as Onychomycosis, may cause nails to become thick, brittle, discolored, or crumbly.
What you can do
- Wear gloves when using cleaning products or washing dishes.
- Moisturize your hands and nails regularly.
- Avoid excessive use of nail polish removers containing acetone.
- Eat a balanced diet with adequate protein, iron, and other nutrients.
- Keep nails trimmed and avoid using them as tools.
When to see a doctor
Consider medical evaluation if:
- The problem is persistent or worsening.
- You have symptoms such as fatigue, hair loss, weight changes, or feeling unusually cold (which could suggest thyroid disease or iron deficiency).
- Your nails become significantly discolored, thickened, painful, or detached.
- Multiple nails are affected without an obvious cause.
A healthcare professional may recommend blood tests to check for iron deficiency, thyroid disorders, or other nutritional issues if your nail changes suggest an underlying condition.
Brittle nails are often harmless and related to environmental factors, but persistent changes can sometimes provide useful clues about overall health.
