Sauerkraut does contain quite a bit of salt and sodium and is bad for you if you eat too much sauerkraut.
That is especially true for people with high blood pressure and heart disease.
If you suffer from heart disease or have high blood pressure then you should not eat as much sauerkraut as you could or would when you're much healthier.
Sauerkraut is very healthy when eaten in moderation due to the natural healthy bacteria and probiotics that sauerkraut contain.
But getting too much sodium or salt can be bad and cause heart disease and heart problems.
So just watch your intake and consumption of the sauerkraut especially if you have high blood pressure and heart disease and you'll be okay.