Iron deficiency can sometimes be associated with nail changes, particularly when other symptoms are present.
Possible symptoms of iron-deficiency anemia include:
- Fatigue
- Weakness
- Shortness of breath with exertion
- Dizziness
- Pale skin
- Headaches
- Feeling unusually cold
However, brittle nails do not prove that you have an iron deficiency.
If you have several symptoms or risk factors for anemia, a healthcare professional can determine whether blood testing is appropriate.
Don’t start high-dose iron supplements simply because your nails are brittle. Too much iron can be harmful.
3. Your Diet May Need More Nutritional Variety
Nails are made primarily of a protein called keratin, so adequate nutrition is important for normal nail growth.
A restrictive or poorly balanced diet may contribute to deficiencies that affect hair, skin, and nails.
Rather than immediately taking a “hair, skin, and nails” supplement, focus on a varied diet containing:
- Eggs, fish, poultry, beans, or other protein sources
- Vegetables and fruits
- Whole grains
- Nuts and seeds
- Dairy products or fortified alternatives
- Other foods providing iron, zinc, and essential vitamins
Supplements are most useful when a genuine deficiency or increased nutritional need has been identified.
4. Thyroid Problems Can Sometimes Affect Nails
Changes in thyroid function can sometimes affect the skin, hair, and nails.
Depending on the condition, other symptoms might include changes in weight, unusual tiredness, sensitivity to cold or heat, changes in heart rate, constipation or diarrhea, or changes in hair texture.
Brittle nails alone don’t indicate a thyroid disorder, but persistent nail changes accompanied by other symptoms are worth discussing with a healthcare professional.
5. Aging May Be Part of the Explanation
Nails naturally change as we get older.
They may become:
- Thinner
- Drier
- More ridged
- More prone to splitting
Slower nail growth and changes in circulation or skin moisture can also contribute.
Good nail care and regular moisturizing can help reduce breakage.
