There are the following reasons for uneven toenails: First, this occurs after trauma, consider the nail bed is damaged so that the nail plate malnutrition caused by, if there is no pain and other discomfort, no medication is needed, the nails grow out cut, slowly trimmed, after a period of time will return to normal. The nail fungus that is caused by impermeable shoes, sweaty feet and fungal infections can also cause uneven nails, which are often accompanied by foot odor, itching, blisters and peeling. Third, vitamin or trace element deficiency makes nutrient intake insufficient to supply the nail growth needs, and nail bump, no luster, to the hospital to take blood tests for trace elements, according to the results of the appropriate amount of supplement body needs, eat more food with high vitamin content, can make this situation reduce or disappear.