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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.
The thickness of the nail is influenced your genetic makeup, what types of foods you consume, and even the weather. There are a couple lung conditions that cause the finger nails to club.. The nail takes a large curve and the fingers look, in general, bigger and rounder. It is seen in patients with advanced lung cancer or high blood pressure in the lungs. I suggest that you schedule an appointment with your primary care physician.