What causes your fingernails to turn gray?

Fingernails can turn gray due to several factors, including insufficient blood flow, which may result from conditions like anemia or circulatory issues. Additionally, exposure to certain chemicals or excessive moisture can lead to discoloration. In some cases, gray nails may indicate a fungal infection or a more serious underlying health condition. If the discoloration persists or is accompanied by other symptoms, it's advisable to consult a healthcare professional.