Medically reviewed by Casey Gallagher, MD Ridges in nails can develop due to a current or past illness or injury. A healthy ...

However, if they appear suddenly or become more pronounced, it may be worth checking for conditions like anemia or thyroid ..

Symptoms like dry or yellow nails, white spots, and dark lines may be normal ... if brittle nails are an ongoing problem. Hypothyroidism (in which the thyroid works too slowly) also causes brittle ...