My nails are turning yellow. do you think i have a nail disease?

Possibly: Yellow nails are often a sign of a fungal infection of the nails. Other diseases also can lead to yellow nails though but these are often associated with other medical problems or symptoms. You should have it checked out by a doctor.

Possibly: Yellowing discoloration of the toenails can be caused by a fungus, however, it can also occur due to thyroid disorders, B12 or B6 deficiency, aging, or trauma to the nail bed. You should have your physician evaluate the nails and if there is any question a nail culture can be completed to evaluate for a nail fungus.