When trying to prevent low blood sugars, it helps to understand their most common causes. The table below outlines the most triggers for lows. If your are currently experiencing either frequent or severe reactions, look carefully at this list to see what might be causing them. Once you identify a cause, decide upon a correction. Remember: when low blood sugars are frequent or severe, it is almost always necessary to reduce current insulin doses. If lows blood sugars happen infrequently, try to identify the trigger so you can make adjustments when you encounter that situation again.