Empty nails usually nails and nail bed can not be adhered to together, there are cavities and gaps underneath, leading to such a situation for a number of reasons, as follows: 1, the common clinical reasons are trauma caused by the degradation of the function of the nail bed; 2, burns lead to increased scarring of the skin around the nails, the nails can not be maintained in the original normal position, which leads to the separation of the nails and the nail bed; 3, due to improper shoes or sports, the foot nails, especially the thumb form 3, due to improper shoes or sports, the shape of the nail, especially the thumb nail, changes in structure, separated from the nail bed, and the nail feels empty; 4, the patient has suffered from periungual inflammation or fungal infections, such as athlete’s foot, which can also lead to separation of the nail from the nail bed; such cases need to ask the doctor to clarify the cause in a timely manner, and to formulate a more accurate treatment plan to improve the symptom.