The nails of the little toe are thick for the following reasons: first, trauma, when the injury will stimulate the nail thickening, which is generally not too worry, as the nail growth, the back part of the nail can gradually become thinner. Second, wearing skinny shoes or squeezing, after squeezing will lead to nail growth to the middle will become thicker, can be improved by wearing looser shoes. If necessary, nail extraction treatment can be performed, and the new nail will be thinner when it grows well. Third, the infection of fungus caused by the general toenail is gray, sometimes accompanied by broken and itchy, you need to go to the hospital in time to check, if necessary, you need to apply local antifungal drugs for treatment. At the same time, the feet should be kept dry, but also need to adjust the diet, such as not eating too spicy food, do not drink alcohol, appropriate intake of vitamins and fiber-rich food.