Fungal infections, such as onychomycosis, can cause the nails to turn yellow. Fungal growth thrives in warm and moist environments.
Psoriasis, a chronic autoimmune condition, can affect the nails and lead to yellow discoloration. It causes abnormal cell turnover in the nail matrix
Smoking cigarettes can stain the nails and cause them to appear yellow over time. The nicotine and other chemicals in tobacco can discolor the nails.
Dark-colored nail polishes, especially if used without a protective base coat, can stain the nails and leave them yellowed.
Some medications can have side effects that affect the appearance of nails. Antibiotics, antimalarials, or antifungal drugs.
Yellow nail syndrome is a rare condition characterized by slow nail growth, yellowing of the nails, and thickening.
A deficiency in certain vitamins or minerals, such as biotin or zinc, can affect the health of the nails and cause them to turn yellow.
Frequent use of nail polish remover, especially those containing acetone, can dry out the nails and lead to discoloration, including yellowing.