Yes, it is possible to have diabetes without knowing. Some people are able to manage their blood sugar levels effectively through diet and exercise alone, while others may experience symptoms such as frequent thirst or urination without realizing that they have diabetes. Additionally, some people with undiagnosed diabetes may not show any outward signs of the condition. For this reason, it is important to get regular check-ups and screening tests in order to diagnose and treat diabetes as early as possible. With proper management and care, people with diabetes can enjoy long, healthy lives free from complications.