Thick and hard toenails are usually caused by fungal infections and can also be caused by trauma.
When fungi such as dermatophytes, yeasts, and molds that are not dermatophytes invade the nail plate and/or subnail tissues, it can lead to cloudy, thickened, separated, discolored, and uneven surface of the diseased nail. The treatment of nail fungal disease is based on oral medication, commonly used drugs include terbinafine, itraconazole and so on.
However, it is not easy for the drugs to enter the nail plate and the nail grows slowly, so the treatment is more difficult and it is necessary to insist on using the drugs. The use of drugs should be under the guidance of medical professionals to avoid adverse reactions.
In addition, thick and hard toenails may also be caused by trauma. It is recommended that patients go to the hospital for timely examination and treatment.