The toenail cracked a line belongs to trauma, nail fungus and other diseases, need to clarify the cause of the disease, for the treatment, treatment methods generally include drug treatment, surgical treatment, etc.. 1. trauma: trauma leads to cracked toenails, according to the degree of disease, reasonable treatment. If the condition is mild, it is necessary to protect the local area, disinfect and bandage in time to prevent secondary infection; if the condition is serious, it is necessary to go to the regular hospital in time to deal with it. 2. Nail fungus: caused by fungal infection, can cause nail fragmentation, the treatment of this disease, can follow the doctor’s prescription oral antifungal drug treatment, such as terbinafine, itraconazole, etc.; drug treatment effect is not good, you can choose the surgical treatment, pull out the diseased nail. It is recommended that patients go to a regular hospital, under the guidance of the doctor to clarify the cause of the disease, timely treatment, to avoid delaying the condition.