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Other possible reasons…
A weak digestive system 
can make it harder for the body to absorb the nutrients needed for strong nails.
And one habit that is often overlooked—nail biting 
—can damage the nail matrix and cause these ridges to appear.
What to keep in mind:
Vertical lines on nails don’t always mean illness 
, but they do deserve our attention 
.
They might signal nutritional gaps, an unbalanced lifestyle 
, or even emotional strain 
.
Care for your inner health, and your nails will reflect it. 
If you’re unsure, always consult a healthcare professional