The reasons why toenails don’t grow may include lack of trace elements, blood circulation obstacles, local injuries, gray nails and so on. 1. Lack of trace elements: Calcium, zinc, selenium, iron and other trace elements are able to promote the growth of nails, if the body lacks these elements, then the toenails will appear to grow slowly or even not grow. 2. Blood circulation disorders: If the foot nails have blood circulation disorders, it will also lead to stop the growth of toenails, especially diabetic patients, due to poor peripheral blood circulation, it is easy to lead to the situation of the nails do not grow. 3. Localized injury: If the nails are squeezed or bruised, it can cause damage to the nail bed or nail root, and the phenomenon of stagnant nail growth will occur. 4. Gray nails: generally caused by one or two or more fungal infections such as ringworm, yeast, etc. The fungus invades the nail bed or sub-nail tissues and causes damage to the nail bed, thus making the toenails appear not growing. There are many reasons why toenails don’t grow, so once you find that your toenails don’t grow, it is recommended that you consult a doctor in a timely manner and get a clear understanding of the specific cause of the disease before treatment.