As a person grows older, their toenails will often grow thicker. Trauma to the toenail can also produce a thickening effect. Such trauma can result from something as simple as the toe repetitively hitting the end of the toe box in shoes that are too short. Thick toenails can also be seen in people with nail fungus (onychomycosis), psoriasis, or hypothyroidism. If problems persist relating to thick toenails, a medical consultation should be sought. Laser therapy is a proven solution for discolored or fungal nail infections.
“Toenails that have grown thicker over time likely indicate a fungal infection, also known as onychomycosis. Left untreated, thick toenails can become painful. If the cause is a fungal infection, it can be difficult to cure and may require months of treatment.”