Nail fungus is a common condition in which fungi colonize the nail plate or the tissues around the nail. This page explains typical signs, how the infection spreads, who is more likely to be affected, daily care to reduce risk, and when specialist assessment may be appropriate.
Fungi such as dermatophytes, yeasts or molds can settle into the nail and multiply. Infection often begins with small color changes or thickening of the nail and may extend from nearby skin fungi. Early changes can be subtle and progress slowly.
Common signs include yellow‑ or brown‑tinged nails, increased thickness, crumbly or brittle edges, and distortion of nail shape. Mild odor may occur. Seek prompt medical attention if you have sudden, severe pain, spreading redness or swelling, fever, or rapidly worsening changes.
Fungal spores thrive in warm, moist places. Shared wet surfaces (showers, pool areas), communal changing rooms, and shared footwear or instruments raise transmission risk. Factors that increase susceptibility include older age, excessive foot sweating, tight shoes, diabetes and weakened immunity.
Keep feet and hands dry and nails trimmed; choose breathable footwear and change socks when damp. Use protective footwear in public wet areas and avoid sharing nail clippers or files—clean or sterilize tools before reuse. If nail changes persist, worsen, or are accompanied by pain or other health issues, seek evaluation by a healthcare professional.
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