I had 2 with it. It hasn't been diagnosed by a vet yet, but they had all the symptoms, the most obvious one being they were both naked. My oldest Heineken was 9 and the youngest Resen is 4. They've both had it for about 2 years and the vet told me that the oldest was too old for surgery, but we could do medication. Last year when I was getting ready to take out a loan to get surgery done, I lost my job. That was a big financial strain and the thought of surgery or medication was put on hold and I'm still trying to get out of debt. Well, Saturday evening the ferrets were in my room when suddenly one of them starts screaming. I open my dresser drawer and Heineken is flailing his legs, with his head thrown back screaming his head off. I had no idea what to do. I wrapped him in a towel and just held him. After what seemed like forever, he finally stopped for a few minutes and would twitch the whole time and then start screaming again. He was having seizures which I have never encountered with a ferret. The ER vet said she felt a mass on his side and said what the problem could be: either a tumor on his adrenal gland that has spread to his brain or insulinoma and they could give him some sugar, but that his blood sugar would drop again and he goes into seizures again. It was a lose, lose situation. We had to put him down that night. That has now put a fire under my rear to at any cost get Resen the necessary medical care done since she is still young and generally healthy enough to tolerate surgery. Thank you so much for the info.