Which of the following is a common cause of onychomycosis?

Onychomycosis is primarily caused by a fungal infection of the nails. Various types of fungi, such as dermatophytes, yeasts, and non-dermatophyte molds, can lead to this condition, resulting in changes to the appearance and health of the nails. The infection typically occurs when the fungi invade the nail bed and begin to grow, often leading to thickening, discoloration, and brittleness of the nails.

Understanding that onychomycosis is specifically associated with fungal organisms is crucial for identifying appropriate treatment measures. While other pathogens, such as bacteria and viruses, can lead to nail issues, they are not the primary agents responsible for onychomycosis. Additionally, parasitic infections are not a common concern when discussing nail fungus, further solidifying the significance of fungi in this context. The distinction of fungi as the main culprit helps in diagnosing and treating the condition effectively.