black vertical marks on nails?
827117
Longitudinal melanonychia is the presence of a pigmented stripe, usually brown or black, along the length of the nail bed in darker-skinned individuals. Longitudinal melanonychia results from deposition of melanin in the nail plate from a variety of causes.
324372
Nail polish and stop stressing!!! ALWAYS have a nail file with you so if you get a jagged edge, your not tempted to "nibble" it smooth.
53007
Get a pedicure where they can clean/scrape the surface of the nails a little, and don't apply any nail polish after that. Just let the nails "air". Apparently, the lack of oxygen causes the nails to yellow.
837303
If it looks like you have black splinters under the nail it is a fungus infection. Try over the counter topical drops but it is hard to cure.\n\nIf it is a dent in the nail or a black blister underneath the nail than the nail got hit and will eventually grow out OK.
1034715
Yes-I suffer from nail discoloration due to hypo-thyroidism myself and I found that zinc and calcium supplements have almost made them disappear : )
318064
You should make an appointment with your doctor to have it looked at.\n\nIt could be from something as harmless as a blunt trauma to the toe, which often takes a while to work itself out and effect the nails.\n\nBut it could also be a symptom of some more serious problem or fungus.
993
A hang nail isn't really a nail, it's a small piece of torn skin near a nail.  They're usually caused by dry skin or nail biting, so can appear at any time.
712693
Don't believe all the rumors and "old wives tales" about white spots under your fingernails.  So far nobody has agreed on a diagnosis for the white spots.  Some say its too much calcium or not enough.  Some say they are like bruises from hitting your fingers.  Nobody knows for sure what causes them and there are no "cures" for them.  They are not abnormal, as many people experience the same thing.
407717
Nail textures: Vertical ridges that appear on the nail can indicate disorders as simple as iron deficiency, poor absorption of vitamins and nutrients, overall poor health or they could indicate something as serious as kidney trouble. (So, you see why consulting your physician is so important.) These vertical ridges, as well as bumpy nails, can also suggest that one is prone to developing arthritis. Ridges running horizontally across the nail can indicate physical or mental stress.
505858
My dad always said it was the amount of lies you told...\n\nBut really, they’re called “leukonychia” and are very common. Most of the time the white spots simply are a sign of some past injury to the base of your nails or an allergy to nail polish.\n\nA lot of people say that it has to do with a calcium deficiency or zinc deficiency, but this isn't true.
93042
can also indicate lead posioning. do you have any blueness around your finger nails? if so go to a doctor soon, like yesterday
1059445
Possibly birthmarks but you should have a doctor check them out.
905488
the white half moon is called the Lunula (part of the nail anatomy).  \n\nwhite spots that appear every so often are due to injury to the nail.  these are harmless and will grow out. \n\nhttp://www.cnn.com/HEALTH/library/WO/00020.html
707117
This was the closest thing i could find:\n ingrowing toe nails\nonychocryptosis?
26683
First keep your nails SHORT and clean. If there is too much pressure in one spot in can cause bleeding. Move your hand around. Don't stay in one spot and don't be too rough.
1098515
No,that is an impossible reason..There's a condition,usually genetic(that is when is transmitted from genaration to genaration),which cause those nasty inproper grow of the nails..See a good specialist,because in the long run you may experience nasty outcomes if neglected..Good luck!!!
1118926
its normal, that means theres a fungal infedction but its very minor and very common, its underneath the nail so it cant spread, and if you really dont like it there are precription pills to take which will clear up nails in about 3 to 6 months, but they're purely cosmetic because the fungal infection does no harm whatsoever.