I have never had raised blood markers. Ever, even when I couldn't get out of bed, even to get to the toilet.
As someone has said - look at any other data sheet - you wouldn't take paracetamol/Tylenol or the pill or anything else.
This is taken from a scientific study on pred:
"Results: Symptoms of hypomania, mania, depression, and psychosis occur during corticosteroid therapy as do cognitive changes, particularly deficits in verbal or declarative memory. Psychiatric symptoms appear to be dose-dependent and generally occur during the first few weeks of therapy. Patients who must remain on corticosteroids may benefit from pharmacotherapeutic approaches, such as lithium and the new antipsychotic medications.
Conclusion: Mood and cognitive changes with corticosteroids appear to be common but generally mild and reversible side effects. More studies are needed to determine effective treatment for steroid-induced psychiatric disorders."
This says that mood and cognitive (memory) changes are common with pred - we all call it "being bad tempered" and "brain fog", can't remember words or can't spell. Or we can't sleep well. These are also classed as "mental health". Probably about a quarter will complain of those things. But no-one gets all the side effects of pred and some people get none of them. I had next to none with one sort, a load with another and none at all with the current form. It all depends, but the data sheets written by the manufacturers have to list every single thing that happened while on pred, and some of them were coincidence.
The first bit lists the really bad aspects - which occur with high doses and really don't often happen with the doses used for PMR. Of the hundreds of people I have "met" on the 3 forums I am a member of who are on pred, only one has had serious problems - and she has GCA plus other previous history things and was on about 60mg a day. As soon as the dose came down, she has been fine, she still takes pred.
I had 5 years of PMR without pred: I had memory and concentration problems, I was bad tempered and depressed - that is part of PMR and if you don't take pred you will almost certainly become depressed. Believe me, being in constant pain and being limited in what you can do really gets on your nerves after a while and REALLY doesn't improve your temper! So it doesn't matter if you are on or not on pred - they will very likely happen.
Take them - and see what happens. if within a week they haven't helped - THEN consider discussing it with your doctor. If what you have is PMR you will almost certainly notice a difference within that time. For me it was 6 hours, I could move. You are aware of what COULD happen, tell your husband/partner/a friend and ask them to watch out for you being "strange" if you are that worried. But try them - if what you have is PMR you'll wonder why you worried.