Not if the ridges are vertical, those often appear as we get young, though no one is sure why? (Moisturizing nails may make the ridges less obvious.) Horizontal ridges can signal trouble, though.
Called Beau's lines, these mean the nail-making process got interrupted, which can happen during a high fever or if we develop an illness like diabetes.
Also, we must talk to our doctor if we see signs of "clubbing," in which the tips of fingers enlarge and nails curve down-ward. That can be a sign of heart or lung problems.
Therefore, as we all know precaution is better than cure! It's always advisable to take advice from the medical experts before it takes a more dangerous turn.