Genetics also plays a role. Some people naturally have ridged nails without it having any impact on their health.

Healthy Habits for Smoother Nails
The good news is that a few simple habits can noticeably improve the appearance of nails. Regularly moisturizing your hands and cuticles is essential. Plant-based oils, gently massaged into the nails, can be especially effective.
Light buffing can also help smooth the surface, as long as it is done occasionally. Too much buffing can thin and weaken the nail. Finally, wearing gloves when doing household chores helps protect nails and maintain their quality day to day.
When Should You Seek Professional Advice?
If ridges appear suddenly, become very pronounced, or are accompanied by other unusual changes, it’s best to consult a healthcare professional. Listening to your body also means paying attention to these subtle signals.
In most cases, however, ridges on the nails are simply a reminder to slow down, stay better hydrated, and adopt a more attentive nail care routine in everyday life.