What might indicate a nail disease?

A change in nail color can be a significant indicator of a nail disease. The color of nails can reflect various health issues, as nails can change due to infections, nutritional deficiencies, or systemic illnesses. For example, yellowing might suggest fungal infection, while a bluish tint could indicate a lack of oxygen in the blood. Such changes are often accompanied by other symptoms, but the alteration in color itself is a clear visible sign that something may be wrong.

In contrast, localized pain, increased growth rate, and improved nail strength are not typically associated with nail diseases. Localized pain may occur for numerous reasons, including injury, but does not necessarily indicate disease. An increased growth rate might suggest a healthy state or other non-pathological factors. Similarly, improved nail strength usually indicates better health and hygiene practices rather than a disease state. Thus, the change in color is the most definitive signal of a potential nail disease.