What are common signs of hyperglycemia in a diabetic patient?

In a diabetic patient, hyperglycemia, or elevated blood glucose levels, manifests through specific signs and symptoms that indicate how the body is responding to excess glucose. Increased thirst, frequent urination, fatigue, and blurred vision are recognized as classic indicators of hyperglycemia.

The increased thirst occurs because the body attempts to dilute the excess sugar in the bloodstream, leading to dehydration. Consequently, this dehydration triggers frequent urination as the kidneys work to eliminate the excess glucose and restore normal balance. Fatigue is another common symptom, as high blood sugar levels can hinder the body's ability to utilize glucose for energy, resulting in feelings of tiredness. Finally, blurred vision can arise due to fluid changes in the eyes caused by the high sugar levels, impacting focus and clarity.

Thus, option A effectively encapsulates the relevant symptoms associated with hyperglycemia, making it the appropriate choice.