Insulinomas are growths that occur on the pancreas of the ferret. These growths release insulin, causing your ferret to suffer from hypoglycemia (low blood sugar). They can be cancerous or non-cancerous in nature.
Symptoms include mild to severe variations of the following: Weakness, lethargy, sleeping for long periods of time and then being very difficult to wake, vomiting, pawing at the mouth, drooling, loss of coordination, disorientation, vocalization while sleeping, and seizures (jerky leg movements with vocalization, urination).
If you ferret has any of the above symtoms, take your ferret to a veterinarian immediately. This disease can be fatal in a short period of time. Treatment includes surgery/ and or medication.
For more great tips on Litter box training and how to teach your ferret some Fun Tricks, purchase The EverythingFerret Complete Guide to Ferrets and Ferret Care.