Nail health is keeping under the nails clean for both men and women and also the nails should be clipped and filed. Most women want longer nails, while men keep theirs short. Often men will go to salons to have their nails manicured as do women. Your doctor can pick up possible diseases you may have by looking at your nails. If your nails are a bluish color by the "moon" part of the nail this can be an indication of a lack of oxygen to your system and your doctor may test you for heart problems or other problems.