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Onycholysis is a condition that causes nails to separate from the nail bed beginning at the distal end of the nail (under the free edge). The nail itself will appear healthy, often maintaining its shape and strength. Techs will be able to see the separation easily on natural nails and through light-colored enhancement products.
Heart disease can turn the nail beds red. Obsessive-compulsive disorder can show up in the nails through persistent nail-biting or picking, Fox says. Even common disorders like thyroid disease can cause abnormities in the nail beds, producing dry, brittle nails that crack and split easily. He lists the following 10 examples of nail changes that could indicate a serious medical condition.