That statement is too vague to be reliable. Whether nail lines are concerning depends on what kind of lines they are.
Here’s a quick guide:
- Vertical ridges (from the cuticle to the tip): Usually a normal part of aging and often become more noticeable over time.
- Horizontal grooves (Beau’s lines): Can appear after a serious illness, high fever, injury, or other conditions that temporarily interrupt nail growth.
- Dark brown or black streaks: These should be evaluated by a healthcare professional, especially if they are new, widening, or affect only one nail, because they can occasionally be a sign of a serious condition.
- White lines or bands: Often result from minor nail trauma, though in some cases they may be associated with underlying medical conditions.
When to seek medical advice
It’s a good idea to have your nails checked if:
- The lines appear suddenly.
- They affect many nails without an obvious cause.
- They’re accompanied by pain, swelling, nail separation, or changes in nail color.
- You notice a new dark streak that changes over time.
Most nail lines—especially vertical ridges—are not a sign of a serious health problem. If you have a photo of your nails, upload it and I can help explain what type of lines you’re seeing and whether they warrant medical evaluation.
