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Doctor insights on: Black Lines In My Fingernails

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Hello, I am an Asian girl with fair skin and I have the vertical black lines on my fingernails and toenails. What does this mean? Thanks.

Hello, I am an Asian girl with fair skin and I have the vertical black lines on my fingernails and toenails. What does this mean? Thanks.

Chemical reaction: Vertical lines in bot finger and toenails could be due to some chemical that was ingested.Horizontal lines are more common and again caused by a drug or something ingested. ...Read more

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Fingernails (Definition)

Fingernails are the hard coverings at the end of fingertips. Nails are made out of a protein called keratin. they function to protect the fingertip and to increase sensitivity of touch. Good hand hygiene and nail care is important to prevent bacterial ...Read more


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Should i be concerned about black lines growing under my fingernails? I'm a 51 year old black female, my father had heart disease, no information on my mother, i'm approximately 170 lbs, 5"3, medium build. I work third shift, i don't exercise regularly,

Should i be concerned about black lines growing under my fingernails? I'm a 51 year old black female, my father had heart disease, no information on my mother, i'm approximately 170 lbs, 5"3, medium build.  I work third shift, i don't exercise regularly,

Hello. : Hello. Sometimes black lines can be small splinter hemorrhages. Sometimes black lines can be associated with skin cancer. Do recommend that you see a dermatologist to have this evaluated to ensure that it is not from a worrisome cause. Take care. ...Read more

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What causes black vertical lines under fingernails ? I am asking for a 66 yr. Old male.

What causes black vertical lines under fingernails ? I am asking for a 66 yr. Old male.

Blood clots : Tiny blood clots, usually broken off from heart valves then float to the end arteries of the fingertips and get caught in the capillaries of the nail bed. They are not dangerous in and of themselves, but could be reflective of a heart problem. ...Read more

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One of my fingernails is turning black and they all have ridges. ....what could be causing this?

One of my fingernails is turning black and they all have ridges. ....what could be causing this?

Nail issues: The best thing would be to have it checked out as it could be anything from fungal infection to injury or other disease. If you have ridges it could also be fungal infection but it is difficult to say without looking at it. See your doctor. If it developed acutely it could be an injury but you would have known it since it would be painful to have it bleed and have the blood underneath turn dark. ...Read more

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I have a small single black line on the tip of my fingernail. It looks like a small splinter...What could it be?

Splinter hemorrhage: It's called a splinter hemorrhage. If you only have them occasionally, don't worry about it. ...Read more

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I've noticed small/thin black lines keep appearing under the tips of my fingernails over the past few days. What could this be from?

I've noticed small/thin black lines keep appearing under the tips of my fingernails over the past few days. What could this be from?

Splinters: Thin longitudinal black lines under fingernails can be what doctors call "splinters" & can reflect tiny blood clot emboli that get caught there, where there are end arteries & capillaries. Such tiny clots end up there after being generated inside left chambers of heart. Cardiologist exam indicated & urgently if dizzy, feverish, chest pain, irregular heart beats or shortness of breath. ...Read more

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One of my fingernails is black by the cuticle and on the front. It doesn't wash off. Is it a fungus?

One of my fingernails is black by the cuticle and on the front. It doesn't wash off. Is it a fungus?

Not necessarily: If it appeared quickly, like over night, then it most probably is trauma. It may also be a mole growing in the area or a fungus. Smokers may get some black in the cuticle and nail. If it lasts for more than two weeks, then go to your dermatologist to have it diagnosed. ...Read more