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If you have high blood pressure, be careful. There is a serious risk of getting too much.
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If you have normal high blood pressure, your risk of developing cardiovascular problems does increase with the level of salt intake, but it’s a slow rise.
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Whether you have normal or high blood pressure, too little salt can quickly become harmful.
This is all according to the PURE study out of McMaster University. Andrew Mente’s presentation about it to Low Carb Breckenridge 2018 was uploaded onto YouTube recently, and there is a link to the video in the LC Breck 2018 thread. He displays all the graphs, plus comparisons with the results of other recent studies.
ETA: My guess is that on LCHF/keto, the risk of too much salt is lower, simply because we are excreting sodium at a higher rate. I doubt very much that any significant percentage of PURE participants were low-carb at all.