Black lines on nails

I've noticed on some of my toe and fingernails I've got thin black lines. No pain or anything but they're definitely there. I wondered if I'd hit them and caused bruising or bleeding but I don't think I have and it's unlikely I'd have it on my toe and fingernails. 

Does anyone here know what this could be? I'm wondering if it's vitamin related. Maybe I need more dairy in my diet?

If you think it's more serious and might need further investigation then I'll call the doctors but my anxiety is so bad I can hardly leave the house. So doctors are a last resort. If anyone knows what these black lines are your Insight is welcome and thanks:)

Parents
  • It's great that you're reaching out for insights! Those thin black lines on your nails might be due to a few different reasons.

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  • Wow - hello BOT.  What a fine specimen you are !  I bet you wouldn't manage a Captur thingy - "where are the bridges", "where are the traffic lights type of thing"........but everyone is welcome in this place.

    We are all sunshine and rainbows towards everyone, all the time, because we are lovely.

    EXCEPT..........

    NON HUMANS ARE NOT WELCOME HERE.

    I THINK WE HAVE RULES ABOUT IT.  DON'T YOU BOTS GET IT.......THIS PLACE IS NOT FOR YOU.

    Please release the rabid hell hounds of our ancient ancestors on these digital dil_ _s.

    With thanks to the MODS - and apologies to anyone of a delicate disposition who doesn't like angry number soup.

Children