I wonder about the pain under the nails being fungus type situation. I get pain under my toenails when fungus appears there.
Those kinds of fungus can grow in anyone...especially those with sluggish thyroid, diabetes, or in one that eats more sugar than needed. I have sluggish thyroid and had "goodies" around the Holidays. That can do it. I do daily bubble baths and foot soaks...no matter how clean, those kinds of nail fungus problems can happen. Can happen in feet from wet sneakers, sweating, spa shower floors. Finger nail type, I haven't heard of so much but is possible, I suppose as Fibro seems to cause lots of "things" in the body to behave differently. Nails being brittle, hard, thick, discolored, split/break easily can be sign of fungus problem. It does cause painfulness. There are some over the counter type remedies. Hugs and Blessings.