1. Frequent Urination (Polyuria): High blood sugar levels cause the kidneys to filter excess glucose, leading to increased urine production. As a result, people with undiagnosed diabetes may need to urinate more often, especially at night.
2. Increased Thirst (Polydipsia): Excessive urination leads to dehydration, which in turn causes increased thirst. Individuals may feel constantly thirsty, even after drinking plenty of fluids.
3. Increased Hunger (Polyphagia): Despite eating enough food, people with diabetes often feel very hungry. This happens because, although there is plenty of glucose in the blood, the body’s cells cannot use it properly without adequate insulin, leaving the body without sufficient energy.

These symptoms may develop gradually, so people often overlook them or attribute them to other causes. Recognizing these early signs is crucial for timely diagnosis and treatment to avoid complications associated with diabetes.