cause of death meaning

I just found the registration of death for my paternal grandmother (using a hint for someone else) and am wondering about one of the causes of death listed. Besides bronchopneumonia for a duration of one month, there was also something else for a duration of five years; however I cannot make out just what it is. It begins with hyper but the rest is illegible, at least to me. Can someone else help please. I copied the line and will do a copy/paste here. She was just 56 when she died.

 

typing what I thoought it said into Google came up with the following message

Did you mean:
hyperthyroidism

hypothyroidism

It could be that

 

Hyperthyroidism I think

 

Thank you.