i heard that you can get a lot of ridging if you are a smoker due to lowered blood oxygen levels. i dont smoke and have a few on my thumb nails, but they’re notoriously bad for their oxygen perfusion, have a lot of problems with it at the moment!
i also get massive horizontal ridges on my toe nails due to nutrient deficiencies (get them when i cant eat for a few days/weeks) and eventually when the ridge reaches halfway along my toes (from bed to tip) the nail snaps off. happened so often since i was a kid that i’ve lost count. i can use the ridges like a medical diary to tell me roughly how long ago my tum last went on strike, its actually very useful!. as i dont have many vertical ridges i’m not sure those are related to nutrient deficiencies….. but other changes (like flaking, spotting etc ) are likely to be nutritional…..
although i could be talking (writing?) rubbish as it’s nearly 3 am and i should have gone to bed hours ago but got sucked into this new (to me) forum. told myself to look at it in the morning but just couldnt wait!
fi xx