What are common signs of hyperglycemia?

In the context of hyperglycemia, which is characterized by elevated blood sugar levels, frequent urination and increased thirst are indeed among the most common signs. When blood glucose levels rise significantly, the kidneys begin to excrete excess glucose into the urine, which leads to osmotic diuresis. This increased urination results in loss of fluids, causing dehydration and, consequently, triggers the sensation of increased thirst as the body attempts to restore fluid balance.

The other signs mentioned in the options, such as increased appetite and weight gain, and slow healing of wounds, can also be associated with hyperglycemia but are not as immediately recognized as the core indicators. Increased appetite (or polyphagia) occurs due to the body's inability to utilize glucose effectively for energy, often leading to a paradox where individuals feel hungrier despite having high blood sugar levels. Slow healing of wounds is a complication that can arise over time in individuals with poorly controlled diabetes, related to reduced circulation and other factors, but is not typically an early sign of hyperglycemia.

Therefore, while some of the other options can be related to hyperglycemia, frequent urination and increased thirst stand out as the primary and most commonly observed signs indicative of this condition.