Daily exposure to chemicals and environmental factors can make nails brittle and prone to splitting. Fungal infections and hypothyroidism, a condition that reduces hormone production, can also cause nails to split. If you experience other symptoms such as weight gain, depression, or fatigue, hypothyroidism may be a factor. Split nails may also indicate deficiencies in biotin, protein, or iron. Frequent hand washing, cleaning agents, and cold, dry climates can weaken nails. Protecting your hands with gloves, moisturizing regularly, and eating a nutrient-rich diet can help prevent these issues. Using nail strengtheners and keeping nails at a moderate length can further reduce the risk of splitting and cracking.
