Splitting or brittle nails (called onychoshizia or brittle nail syndrome) are common — and while sometimes it’s just external damage, your body can occasionally be signaling something deeper.
Here’s what breaking nails may be trying to tell you:
1. Too Much Water + Chemicals (Most Common Cause)
Frequent:
- Hand washing
- Dishwashing
- Hand sanitizer use
- Nail polish remover (especially acetone)
Repeated wetting and drying weakens nail layers, causing peeling and splitting.
Fix:
✔ Wear gloves for cleaning
✔ Use cuticle oil daily
✔ Limit acetone use
2. Iron Deficiency
Low iron can cause:
- Thin, brittle nails
- Spoon-shaped nails (curving upward)
- Fatigue, hair thinning
If your nails break easily and you feel tired or cold often, it’s worth checking iron levels.
3. Hypothyroidism
An underactive thyroid may cause:
- Brittle nails
- Dry skin
- Hair thinning
- Weight gain
- Fatigue
If nail changes come with these symptoms, a thyroid test may help.
4. Biotin Deficiency (Less Common)
Biotin helps keratin production. True deficiency is rare but possible.
Some studies show 2.5 mg biotin daily may improve brittle nails — but only after several months.
5. Aging
Nails naturally become:
- Thinner
- More ridged
- More prone to splitting
This is common after age 40–50.
6. Low Protein Intake
Nails are made of keratin (a protein). Poor nutrition can lead to weaker nails.
Make sure you’re getting enough:
- Eggs
- Fish
- Beans
- Lean meats
- Nuts
When to See a Doctor
Get checked if you notice:
- Sudden severe nail changes
- Dark streaks
- Nail separation from the nail bed
- Pain, swelling, or infection
- Other body symptoms (fatigue, hair loss, weight changes)
Quick Nail-Strengthening Plan
- Moisturize nails daily (cuticle oil works best)
- Avoid harsh chemicals
- Keep nails trimmed
- Eat enough protein + iron
- Stay hydrated
If you want, tell me:
- Your age
- Any other symptoms
- How long this has been happening
I can help narrow down the most likely cause.
