- Malnutrition
- Anemia
- Liver disease
- Congestive heart failure
Blue Nails
People who undergo surgery are often asked to remove their nail polish. This is because the doctors and nurses need to see if the nails will turn blue during the operation. Blue nails often mean a lack of oxygen supply. However, they may also suggest:
- Lung disorders, like emphysema
- Heart problems
- Silver poisoning
- Bacterial infection
Additionally, certain chemicals may turn the nails blue, like those used to remove paint and clean metal. Medications can also result in bluish nails. These medications include anti-malarial drugs and those that regulate the heartbeat.
Dark Lines
Another reason why you must know about the changes in fingernails and health conditions associated with them is because the underlying condition may be serious. For instance, if there is a dark line – often a thick one – on your nail, go to your doctor immediately. Dark lines can be a symptom of melanoma, a serious kind of skin cancer. However, there could also be other reasons for this change in the fingernails:
- Mole
- Trauma to the fingers
- Result of medication

Texture Changes in Fingernails and What They Mean
Rippled Nails
Rippled nails look like there are tiny holes on the nail. Sometimes, this is also called nail pitting. While not life-threatening, this change in the fingernails may indicate:
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