The body is truly remarkable and if we listen to what it is telling us, we can live a long and healthy life. At times, however, problems can occur and if we recognize them early enough, we have the opportunity to overcome the difficulty. One of those problems is cancer, which can show up under the fingernails and is often seen as a dark line in the nail.
When some people see a dark line in their fingernail, they may feel as if it is an injury and simply wait for it to go away. The fact of the matter is, however, it can be the sign of a very serious and potentially deadly problem. See a dermatologist.