What are common signs of a fungal nail infection?

The signs of a fungal nail infection typically include discoloration, thickening of the nail, and a foul odor. Discoloration can manifest as yellow, brown, or even greenish tones, indicating that the infection is present. The thickening occurs as the fungal infection affects the nail's structure, often leading to brittle or crumbly nails. A foul odor can develop due to the breakdown of organic matter caused by the fungus, which is often indicative of an unhealthy nail condition. These symptoms are key indicators that distinguish a fungal infection from other types of nail issues.

The other signs mentioned in the other options are more associated with different conditions. For example, swelling and redness are often indicative of a bacterial infection or an inflammatory response rather than a fungal infection. Increased nail growth is a normal process and does not specifically point to a fungal infection. Bright white patches on the nail can indicate other conditions, such as contact dermatitis or a different type of nail disorder, and are not typical signs of a fungal infection. Understanding these specific symptoms can help in identifying and treating nail infections effectively.