Salt works on your kidneys to make your body hold on to more water. This extra stored water raises your blood pressure and puts strain on your kidneys, arteries, heart and brain. That's why.
That's why
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The impact of salt on hypertension is not understood completely yet.

    It seems the liver cannot remove a large amount of salt from the blood.  With high amounts of salts in the diet, kidneys do not function well in some people due to renal failure.

    People who eat a large amount of salt regularly like more than 5 grams of dietary salt could get heart attacks due to high blood pressure.
Salt has an effect on the increase of left ventricle in the heart, and thickness of arteries.

     It seems the arteries also become stiff.  So salt increases blood pressure.
Inside kidneys, the glomerular capillary pressure, ie., (at the joining of many arteries) increases.  Excess salt also causes abnormalities in metabolism too.