Following copied from NIH Web Site.

"Why is this medication prescribed?
Hydrocortisone, a corticosteroid, is similar to a natural hormone
produced by your adrenal glands. It is often used to replace this
chemical when your body does not make enough of it. It relieves
inflammation (swelling, heat, redness, and pain) and is used to treat
certain forms of arthritis; skin, blood, kidney, eye, thyroid, and
intestinal disorders (e.g., colitis); severe allergies; and asthma.
Hydrocortisone is also used to treat certain types of cancer."

I think my wife will follow suggestion from her Onc to use it.