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what causes fingernails to turn black

A 65-year-old female asked:
Dr. Michael Fisher
31 years experience Dermatology
Onychomadesis: Onychomadesis is defined as spontaneous separation of the nail plate from the nail bed, beginning at its proximal end and resulting in the shedding of ... Read More
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A 60-year-old female asked:
Dr. Laurence Badgley
52 years experience General Practice
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 ... Read More
A 35-year-old female asked:
Dr. Ramon Garcia-septien
44 years experience Family Medicine
Fungis infection: Most of the case are due to Onycomicosis or fungis infection.
A 30-year-old member asked:
Dr. Christopher Nicora
23 years experience Internal Medicine
No worries: Vertical nail ridges extend from the cuticle to the tip of the nail. Vertical nail ridges often become more numerous or prominent with age, possibly d ... Read More
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A member asked:
Dr. William A Biermann
45 years experience Medical Oncology
Injury: Trauma and some illnesses can do this. Remember that nails are related to hair but grow more slowly so that an injury to them may show up over time. ... Read More
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A 46-year-old member asked:
Dr. Heidi Fowler
24 years experience Psychiatry
Koilonychia.: Possible causes include: iron-deficiency anemia, hemochromatosis, Raynaud's phenomenon or lupus erythematosus.
A member asked:
Dr. Gurmukh Singh
48 years experience Pathology
Depends: Vertical ridges are part of normal growth of nails. You may visit this site for more info in this topic: https://www.mayoclinic.org/healthy-lifestyle/ ... Read More
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A 52-year-old member asked:
Dr. Ryan Phasouk
17 years experience Family Medicine
Varies: The cause of fingernails falling off can be secondary to trauma, infection, or other systemic diseases.
A 43-year-old member asked:
Dr. Michael Fisher
31 years experience Dermatology
Beau's lines: Beau's lines, which are grooves that run horizontally across the nail plate. They usually develop when nail plate growth, which begins in the nail mat ... Read More
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A 31-year-old member asked:
Dr. Aletha Tippett
23 years experience Family Medicine
Many reasons: Vertical ridges on nails are basically harmless & can be related to heredity, aging, & nail dryness or injury. The appearance of ridges may be reduced ... Read More
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