Why Do My Fingernails Curl Down?

Usually an insufficient intake of the Vitamin B12 tends to cause excessively dry, very curved and rounded nail ends. The appearance of the nail may also look darkened. However, if your nails are twisting like corkscrews, then it could be that they are simply too long. In some cases, downward-curved nail ends possibly could denote liver, heart or respiratory problems.

If the increased convexity of your nail fold is accompanied by other symptoms such as increased ballotability and a thickening of the entire distal finger, it could be a condition called clubbing. Some symptoms that should not be ignored as they could possibly mean nail problems include pain, changes in colour or shape, dents or ridges appearing in the nail, persistence of white or of black lines etc. It is recommended that these should be reported to your dermatologist.

A few general tips to help you take care of your nails would include keeping them clean and dry, cutting them straight across while rounding them a little at the tip, not biting them or removing the cuticle and using a "fine" textured file.