If you have lines on your nails, it means you have c…See more

result from nail polish staining or fungal infection.
However, persistent yellow nails—especially when thickened and slow-growing—can indicate a rare condition called yellow nail syndrome, which is associated with respiratory disorders and lymphatic problems.
In other cases, yellowing may be linked to diabetes, where high blood sugar levels affect circulation and immune function, increasing susceptibility to fungal infections.
Bluish or purple nails may signal insufficient oxygen in the blood.
This condition, called cyanosis, can be related to lung diseases such as chronic obstructive pulmonary disease (COPD), asthma, pneumonia, or heart conditions that impair oxygen delivery.
When the nail bed appears blue