Nails fall off half, first of all, to clarify what causes, if it is caused by trauma can be through routine disinfection, prevention of infection treatment; if it is caused by fungal infections, need to choose antifungal drugs in a timely manner. 1. caused by trauma: first of all should be rinsed with saline, and then wipe the nail bed with iodine and the skin around the nail routine disinfection, and then use sterile gauze for bandaging, keep clean and dry. At the same time, follow the doctor’s instructions to change the medicine on time to prevent infection. 2. Fungal infections: Fungal infections may cause thickening of the nails, brittle nails, and even lead to symptoms of nail loss. Need to carry out fungal testing to clarify the cause of the antifungal treatment, can be used externally with cyclopiazide ointment, amorphophine nail polish and other antifungal drugs, oral itraconazole capsules, terbinafine tablets and other drugs in serious cases. Half of the nails fall off, you need to go to the hospital first to check and clarify the cause of the disease, all drugs should be used under the guidance of a professional doctor.