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1. Respiratory Health Issues. Downward curved fingernails can indicate a problem with respiratory health, and are often present in people who have medical conditions such as COPD, chronic bronchitis, asthma and lung cancer. Fingernails often curve downwards as a result of lack of oxygen.
Another popular theory is that fingernails grow faster because they are closer to your heart, and therefore receive more blood. This idea is buttressed by studies like Beanâs (because your circulation slows as you age) and others that show fingernails and toenails grow fastest during the summer, when our circulation is best.