However, striped nails can also be a sign of certain medical conditions. Beau’s lines, for example, are horizontal ridges that can form on the nails due to severe illness, high fever, or malnutrition. These lines typically appear when the body undergoes significant stress, such as after an infection or surgery. In many cases, they grow out over time as the nail heals. Melanonychia, which involves dark vertical stripes on the nails, especially if they appear suddenly, can sometimes signal a condition that requires medical evaluation. In some cases,
melanonychia is associated with melanoma, a type of skin cancer, so it’s crucial to have sudden dark stripes checked by a healthcare provider. Fungal infections can also lead to streaks on the nails, often appearing as white, yellow, or dark streaks depending on the type of infection. Autoimmune disorders, like psoriasis, can also cause nail changes, such as ridges, discoloration, or other nail abnormalities.While most causes of striped nails are not serious, there are certain signs that should prompt a visit to the doctor. These include the appearance of dark stripes that were not there before, deep horizontal grooves, and changes accompanied by nail pain, brittleness, or peeling. If you notice any of these changes, it’s important to consult with a healthcare professional to rule out any underlying conditions and ensure proper nail health.