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A fungal nail infection (also known as onychomycosis) is a common condition where fungi infect the nail, making it thickened, discoloured, and brittle. It often starts at the edge of the nail and gradually spreads across. The infection can affect both fingernails and toenails, though it’s more common in the toes due to warm, moist environments inside shoes.
Fungal nail infections are caused by overgrowth of fungi that thrive in warm and damp areas, such as inside shoes or public changing rooms. They can also develop after minor nail injuries or from untreated athlete’s foot spreading to the nails. Those at higher risk are people with diabetes, poor circulation, or weakened immune systems.
The symptoms include thickened, discoloured, or crumbly nails, often yellow or brown in colour. You might also notice the nail becoming distorted in shape or separating slightly from the nail bed. In some cases, there may be mild discomfort or an unpleasant odour.