Blood pressure is important to track because high blood pressure is associated with a greater risk of organ damage, such as kidney damage and retinal damage, in people with diabetes.
Because of the extra threat of organ damage, people with diabetes are actually given more strict targets for blood pressure than other patients.
Non-diabetic people have a target of keeping below 140 over 80 millimetres of mercury.
For people with diabetes, the target is below 130 over 80.
Blood pressure symptoms: http://www.diabetes.co.uk/high-low-blood-pressure-symptoms.html