Salt and blood pressure do not go hand in hand. High levels of sodium elevates the blood pressure level in the body.
Our body needs sodium to function, but high levels of it are dangerous.
We think of sodium when the discussion is around salts, it is because we consume sodium in the form of salt mostly.
Since salt is detrimental to health we need to cut down its consumption mainly through packaged foods. Just like sugar, processed foods have lots of hidden salts in it.