Nails that buckle on both sides are considered to be related to trauma, micronutrient deficiencies, iron-deficiency anemia, and nail fungus disease. 1. Trauma: Nails are damaged by trauma, which may cause them to buckle on both sides, usually accompanied by pain. 2. Micronutrient deficiencies: Frequent partiality and picky eating, excessive weight loss leading to nutrient deficiencies, such as zinc, calcium, vitamin deficiencies, will have an impact on the growth of the nails, resulting in nails sticking up on both sides. 3. Iron deficiency anemia: Iron is one of the indispensable trace elements in the human body, such as insufficient iron intake, excessive loss, may trigger iron deficiency anemia. This may lead to pale nails, loss of the original red color, thin, brittle and easy to crack, spoon-shaped nails and other manifestations. 4. Nail fungal disease: fungi invade the nail plate and nail bed, resulting in thickening of the nails, yellow color, and the shape of the nails may change, resulting in buckling at both ends. When external forces cause nails to buckle at both ends, it is recommended to go to the hospital in time to get a clear diagnosis and follow the doctor’s instructions for treatment.