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.
1 Nail Splitting and Nail Cracking Split nails or cracked nails can be problematic all on their own, but they can also be fingernail disorders that signal another health problem. 2  Nail splitting and nail cracking can be due to a thyroid condition (hyperthyroidism or hypothyroidism) or psoriasis. Nail Splitting and Nail Cracking Split nails or cracked nails can be problematic all on their own, but they can also be fingernail disorders that signal another health problem. 2  Nail splitting and nail cracking can be due to a thyroid condition (hyperthyroidism or hypothyroidism) or psoriasis.