Final answer:
Both hyperglycemic and hypoglycemic patients can experience blurry vision, excessive urination, and fatigue as common symptoms.
Step-by-step explanation:
Both hyperglycemia, which is high blood sugar, and hypoglycemia, which is low blood sugar, can cause a range of symptoms. However, one symptom that is shared between the two conditions is blurry vision. This shared symptom occurs due to the impact that fluctuating blood sugar levels can have on the fluid levels in the eyes, leading to changes in the lens's ability to focus. Another common symptom is excessive urination (polyuria), as the kidneys attempt to rid the body of excess glucose in hyperglycemia, or because of the diuretic effect of some hormones released during hypoglycemia. Additionally, both conditions may result in individuals experiencing fatigue or tiredness.