Which of the following is a common sign of nail fungus?

A common sign of nail fungus is color changes in the nail. This condition typically manifests as yellow, brown, or even white spots under the nail or within the nail bed. As the infection progresses, the discoloration may become more pronounced, potentially leading to the nail's complete change in appearance. This color change is due to the fungal invasion affecting the nail's growth and structure.

While thinning of the nail, the appearance of ridges, and hangnails may indicate other nail disorders or issues, they are not specifically characteristic of nail fungus. Thinning can suggest issues such as trauma or nutritional deficiencies, ridges are often seen in various nail conditions or normal aging, and hangnails are related to skin health rather than the health of the nails themselves. Recognizing color changes is essential for early identification and management of nail fungus, as timely intervention can help prevent further complications.