Cracked toenails may be caused by trauma, onychomycosis, etc., and should be improved by general measures and medication. 1. trauma: if the toenail is cracked due to trauma, usually there will be local bleeding, need to be sterilized with iodophor, and then covered with sterile gauze to avoid causing infection. 2. Tinea pedis: cracked toenails may also be caused by tinea pedis, patients should pay attention to personal hygiene, keep local clean. The patient should pay attention to personal hygiene and keep the area clean. Oral antifungal drugs can be taken as prescribed by the doctor for treatment, such as itraconazole, terbinafine and so on. Combined with amorolfine application and other drugs to enhance the efficacy. There are more reasons for cracked toenails, so patients should seek medical examination and choose the appropriate way to deal with it according to their personal situation.