Which of the following is a common complication during dialysis?

Hypotension, or low blood pressure, is a common complication during dialysis. This occurs due to the removal of fluid from the bloodstream during the procedure, which can lead to a sudden drop in blood volume and consequently, blood pressure. This can cause symptoms such as dizziness, lightheadedness, and fainting.

Understanding the mechanisms behind dialysis is key; during the process, excess fluid and waste products are filtered out of the blood, which can lead to shifts in fluid balance. It's crucial for healthcare providers to monitor patients closely during this time to manage any episodes of hypotension effectively.

The other options, while they can occur in some patients during or after dialysis, are not as commonly associated with the procedure itself. Nausea may occur due to various reasons, including electrolyte imbalances, while insomnia and skin rashes can result from other factors but are less directly linked to the dialysis process. Thus, hypotension is recognized as a primary concern during dialysis due to its immediate impact on patient safety and comfort.