Hollow toenails can be caused by trauma, gray nails, hyperthyroidism and other factors.
1. trauma: toenail suffered trauma, such as heavy objects, may lead to nail flesh separation, will make the toenail appear empty phenomenon, may also be accompanied by pain, swelling and other symptoms.
2. Gray nails: may be related to fungal infections, infection aggravation, will lead to empty toenails, serious cases will also lead to nail plate shedding, and has a certain degree of contagious.
3. Hyperthyroidism: toenails become empty may also be related to hyperthyroidism, may also be accompanied by nail thickening, separation from the nail bed, loss of appetite, limb weakness, fear of heat, excessive sweating and other symptoms.
The toenail long empty, may be the existence of abnormalities, it is recommended to timely medical examination and treatment, to avoid adverse effects.