Nail splitting is caused by numerous health issues such as kidney disease, stress, depression, nutritional deficiency, infections, injury, Psoriasis, or wear and tear. If you work mostly with your hands, then you can have split nails. Having split nails is a harmless and common condition. You can manage nails splitting by keeping your nails healthy and clean. Don’t keep them in the water for a long time, and don’t use harsh nail polish removers. If necessary, you can use nail hardening products and don’t bite your nails.