Irish Mac,
Yes, it is, depending on what is going on with the body and meds.
If on chemo, there is usually also steroids given at the same time which causes blood sugar to rise a LOT.
With cancer, the body is sick and as such, the blood sugars may also rise, as they do when you have a cold or some other illness.
However, if there is a tumor IN the liver itself, that might cause the blood sugars to go down as it interferes with the glucose/sugar released from the liver. You can have a sudden, low blood sugar event for no apparent reason.
It is very important to have someone managing your diabetes/blood sugar treatment while hou have active cancer or cancer treatment.
Juli T.