Soft fingernails can be caused by a lack of trace elements or nail malnutrition. 1. Lack of micronutrients: lack of micronutrients can lead to soft fingernails, it is recommended to take almonds and eggs rich in protein; milk and tofu rich in calcium; pumpkin and carrots rich in vitamins, etc., and pay attention to avoiding external injuries. 2. Nail dystrophy: specific manifestations of thinning nails, fragile, deformation, loss of luster, usually occurs in more than one nail, can take vitamin B, vitamin C tablets under the guidance of the doctor. Usually should pay attention to diet, supplemental trace elements, prohibit spicy stimulating food, quit smoking and alcohol, eat more vegetables and fruits.