Addison's Disease Support Group
Addison's disease (also known as chronic adrenal insufficiency, or hypocortisolism) is a rare endocrine disorder. It is estimated that it affects about 1 to 2 in 100,000 people. It occurs when the adrenal glands, seated above the kidneys, fail to produce enough of the hormone cortisol and, sometimes, the hormone aldosterone
So in my opinion a person with Addison's would be the very last person that should have these done. The immune system is already compromised and would not handle this huge stress. I know this note sounds very harse but I truly have your health in mind.
I'm a bit late responding, but I encountered the same situation last year, after having an upper rear molar removed. I researched the benefits and risks, ultimately deciding No Way. I went for a second opinion with an maxillofacial surgeon, who confirmed upper implants are ill-advised, moreso for those who face health challenges, especially AI. He was actually annoyed with 'push' for implants, but his business is booming for bone restoration!! Apparently, upper implant hardware frequently infiltrates the sinus cavity, causes chronic sinus infections, severs nerves, etc. There is also a chance of bone infection & acceleration of bone loss, regardless of whether implant is upper or lower.
Wise decision Vizslamom!