I have hypertension and type two diabetes, occassionally, i have modetate swelling in my feet and ankles.whats the cause?

Complicated: There are physiologic feedback loops of most major glandular systems in the body. This is a very complicated subject, however quickly: hypertension is high blood pressure and can be primary or secondary, overlayed is diabetes. If hypertension is related to high blood volume, such as seen in congestive heart failure you will see swelling or edema in the extremities. See an md asap.

Nephropathy: Diabetes damages the kidneys by elevated glucose and dehydration. Then, excretion of sodium becomes impaired, and volume overload results in the swelling you describe. Diabetic vascular damage also promotes the fluid leakage and peripheral edema.See your doctor for complete evaluation and aggressive dm management.