As a quick reminder, the different categories of insulin are: 1  Rapid-acting. 2  Short-acting (regular). 3  Intermediate-acting. 4  Long-acting.
This condition may also affect people with kidney problems, as a loss of protein in the urine can cause feet to swell. Another cause of foot swelling is inactivity ... in a car or riding on an airplane all day, your leg muscles aren't working as much, and fluid will pool in your feet and legs ...
The most common cause of foot swelling is inflammation. Inflammation can be caused by two major causes (1) infection -- this often causes redness, warmth, pain as well -- which does not seem to be what you are experiencing (2) sterile inflammation.