1 Calcium and vitamin D intake. 2  A diet low in calcium and vitamin D makes you more prone to bone loss. 3  Medication use. 4  Some medicines increase the risk of osteoporosis. 5  Activity level. 6  Lack of exercise or long-term bed rest can cause weak bones. 7  Smoking.
Signs and Symptoms. 1  Nail splitting affects the fingernails and the toenails. The condition may appear as a single horizontal split between layers of the nail plate at the growing end or as multiple splits and loosening of the growing edge of the nail plate.
On the scalp, it may cause redness, irritation, and, in some cases, hair loss. Sometimes this disease affects the areas of skin where you had a trauma, such as a superficial scratch, cut, or burn. Lichen planus of the nails can cause brittle or split nails, and the affected nails may have ridges running lengthwise.