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总结
多家英文媒体援引美国医生及英国NHS提醒称，指甲外观的细微变化可能是身体早期求救信号，甚至可在其他症状出现前数月提示严重疾病风险。报道归纳了多种需警惕的表现，如指甲出现黑/棕色纵线或色斑、甲面凹陷或鼓起、易断裂分层、甲床颜色异常、指甲周围出血肿胀等，并强调若变化持续、扩大或伴随疼痛，应尽快就医评估，排查营养缺乏、感染及黑色素瘤等癌症可能。
正文
Health alert: 5 warning signs on nails you should not ignore Times of India US doctor flags 5 subtle nail changes that could be your body's first cry for help: 'These can precede other symptoms for months' The Indian Express Small change in your fingernails could signal deadly cancer before obvious symptoms develop UNILAD NHS warns to check fingernails and toenails for 'silent killer' Cambridge News People urged to check fingers and feet for 'silent killer' that can be made worse over Christmas period LADbible
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