Very soft and thin nails may be related to congenital causes, malnutrition, fungal infections, etc. Nail coating, improving nutrition and medication can be applied. 1. Congenital causes: soft and thin nails are congenital causes, the nails are thin and soft after birth, you can apply nail film to increase the thickness and hardness of the nails. 2. Malnutrition: very soft and thin nails can be considered as a result of malnutrition, this time you need to adjust your diet, eat more fresh vegetables and fruits, pay attention to the daily diet balanced, appropriate food and nutritional matching, the body intake of sufficient nutrients, the thickness and hardness of the nails can be slowly restored. 3. fungal infection: nails are very soft and thin can be considered fungal infection, nail fungus caused by nail abnormalities, can be used externally amorphophallus hydrochloride application to improve, if necessary, can be taken orally itraconazole capsules and other drugs, the use of medication need to be guided by the doctor. When the nails are soft and thin and want to become hard, you can go to a regular hospital, the doctor will take into account the actual situation of the nails, and follow the doctor’s instructions to use drugs.