Nail cracking, if it is caused by trauma, should be actively sterilized and bandaged to prevent infection; if it is caused by onychomycosis, you need to take antifungal treatment measures in time. 1. Trauma: first of all, it should be rinsed with saline to clean up the secretion, after which it should be bandaged with sterile gauze to protect the wound, as well as the surrounding skin cleanliness and hygiene to prevent infection. 2. Nail fungus: formaldehyde caused by fungal infection may cause nail color change, brittle nail texture, nail cracking, etc. Anti-fungal medications such as amorphophallus application and cyclopiazide application can be used externally and anti-fungal drugs such as itraconazole capsules and fluconazole capsules can be taken orally to treat the problem. Cracked nails need prompt medical attention and treatment as prescribed by the doctor.