Which of the following is a common symptom of diabetes?

Increased thirst, also known as polydipsia, is a common symptom of diabetes. This occurs because diabetes, particularly when blood sugar levels are poorly controlled, can lead to high glucose levels in the blood. As the kidneys work to filter and excrete this excess glucose, they also draw more water from the body, leading to dehydration. The body responds to dehydration by triggering the feeling of increased thirst, prompting the individual to drink more fluids.

Improved energy levels, rapid weight gain, and high blood pressure are not typical symptoms associated with diabetes. In fact, individuals with diabetes may experience fatigue due to their body's inability to effectively use glucose for energy. Weight changes can vary, but diabetes often leads to weight loss rather than weight gain, especially in type 1 diabetes. High blood pressure can be a complication of diabetes, but it is not a direct symptom of the condition itself.