12. Yellow Nails
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Heavy smoking or the frequent use of nail polish or acrylic nails can often cause yellow nails, but yellow-colored nails can also mean that you have a fungal infection. Luckily, a fungal infection can be easily treated, but if you also experience fatigue and frequent urination, it could indicate diabetes, which is a more serious condition. Yellow nails can also mean that you have chronic bronchitis, a buildup of fluid on the lung membrane, or an overinflation of the alveoli, all of which require a visit with your doctor.
