I've read alot of sites about fingernails. This topic comes up frequently, including for ME.

The vertical ridges seem to be more or less described as part of aging. They also show up with hypothyroid issues (I have both situations.)

I also have a finger that I pinched doing garden/rock work, and it has a HUGE vertical ridge with a depression now about 2 millimeters wide. I guess I damaged the growth plate. This finger is also the same that was smashed by my Dad accidently in a car door when I was small. So I guess it was destined to be ruined forever!
That was a MESS and painful as I remember.

The horizontal ridges can be from arsenic poisoning, or nutritional deficiency (sometimes comes after a surgery or trauma). They are called Beau's lines.

I found a really good site...let me see if I can retrieve it now....
searching....
Here it is:
http://hooked-on-nails.com/naildisorders.html
The pictures on this site are the best I have found, over the years. The vertical ridges are at the bottom of the page.

Women typically worry more about this subject than the guys do. (obviously)

Autoimmune issues can cause the nail to separate from the nail bed in some cases. Fungus will do that too.

Went to nail website. It turns out I did not know much about nails. Thanks

One can find alot of conflicting information about fingernail appearances on the net.

Mayo even has one site!

The one I gave seemed to me the best I've viewed so far, but it might turn out to have errors as well.
The pictures are the clearest tho and the most helpful I have seen yet.

Fingernails can show disease. Kidney disease, clubbing, and splinter hemorrhages are the most often evaluated by doctors.
The less serious signs are often paid less attention.

Although, when my endo was screening me for my thyroid he looked at my nails carefully and palms (the palms were orange tinged, which is a sign of low thyroid). Nails will split and break if you are low.

Thank you so much for this site. You are a wonderful source of knowledge, mrsD. I appreciate you very much.