Thin black lines on thumb

[Dawny08]

What can cause thin black lines on my thumb?i have had them for a while and at first I thought they were two splinters but they don’t seem to be they are only very small but I would like to know what they are.

[SeasideSusie Remembering]

Do you have a thyroid condition? I've never heard of this connected to any thyroid condition.

[Naomi8]

Do you mean under the nail?Is so,vertical or horizontal?

[Dawny08 in reply to Naomi8]

Hi they are horizontal

[Naomi8 in reply to Dawny08]

Are they under the nail?

[ZippyAppletush]

Hi, I have hypothyroidism (diagnosed at 6 months) and have had similar marks when under-treated. They don’t hurt and seem to ‘grow out’.

[Ladybex]

I have these thin black lines through my fingers at times ... they don’t stay though. I have an under active thyroid and fibromyalgia... if I find out I will let you know 🤔

[humanbean]

Could you caught your thumb in a door or accidentally hit it with something? The black lines may be old blood under the thumbnail or under the skin or wherever it is from a forgotten injury. We would really need to see a picture to have any hope of offering sensible suggestions.

I've had blood under a thumbnail in the past that took ages to go because the blood moved with the nail, and I had to grow out the damage.

[Dawny08]

Is anybody getting joint pains? I keep getting a very painful left knee , I’m on Activis , also pain in my left side under my ribs

[Marz in reply to Dawny08]

Maybe a new post for your knee issue ... ? VitD levels - are they good ?

[Dawny08 in reply to Marz]

Thank you I will get my bloods done

[helvella Administrator Thyroid UK]

If you add a photograph to your original post in this thread, I expect you will get responses from people who recognise what you have.