Horizontal ridges in thumb nails?

You probably just mashed it in something. Any white or purple spots?

My mom has them, her mom has them. I’m just starting to get them. It’s probably a hereditary thing. I’m thinking about regular manicures to see if that helps.

I have vertical ridges. I read zinc levels affect nail growth so I bought some.

What causes horizontal ridges in fingernails?

No spots or colouring. I have really long and healthy nails, aside from the thumbs being bumpy. I don’t have any medical problems that some websites suggest. What it looks like to me is the little half moon is a bit raised, which is causing the nail to grow with shallow ridges. It’s strange!

I had them and what I did was take a nail filer and filed it down a few times now they are gone. Hope I helped!