Common causes of nail thickening include trauma, fungal infections, psoriasis, and so on. If the nails are traumatized, thickening of the nails may occur during the recovery process, which can gradually return to normal if the wounds are mild. If there is a fungal infection, gray nails will appear, the nails will become thicker, accompanied by color changes, nail separation and other symptoms, and need to carry out antifungal treatment in a timely manner. If psoriasis exists, it can be manifested in the palms and feet, with a series of phenomena such as thickening of nails, punctate depression, turbidity of nails, and nail peeling. If the phenomenon of thickening of nails occurs, you should go to the hospital for examination in time to clarify the cause and then carry out the corresponding treatment.