Hypertension High blood pressure. This can be caused by too much salt intake, fluid build-up, or too much of the hormone renin, produced by the kidneys. Hypertension can cause headache, blurred vision, blindness, heart damage, and stroke. Hypotension Low blood pressure. This can occur if large amounts of fluid are removed from the blood vessels too quickly during dialysis.
Hypotension can cause a fast pulse, dizziness, and sometimes nausea, vomiting, or fainting.