9. Medical Conditions and Medications
Nails sometimes reveal signs of internal health problems. Thyroid disease, liver disease, anemia, and circulation issues may contribute to nail splitting. Certain medications, including chemotherapy drugs, can also weaken nails.
Persistent nail changes combined with other symptoms should be evaluated by a healthcare professional.
10. When a Vertical Split May Be Serious
Most nail splits are harmless, but a persistent crack that does not heal — especially if accompanied by pain, bleeding, swelling, or discoloration — should be examined by a doctor.
In rare cases, unusual nail changes can signal serious conditions such as melanoma or other nail disorders that require medical attention.
11. Dermatologist-Recommended Ways to Strengthen Nails
