Onycholysis describes separation of nail from its bed, producing a white or opaque zone from trapped air. Triggers include chemicals, medications, thyroid imbalance, psoriasis, fungus, trauma, and prolonged water exposure. It typically starts at the free edge and moves inward. Management focuses on the cause: keep nails dry, trim back loose portions, avoid irritants, and allow gradual regrowth. When linked to systemic illness such as thyroid disease, correcting that root issue helps prevent repeat episodes.
