Bursitis is very painful. The area is usually very red and slightly swollen.
I have sciatica and did consider it to be a bursa which was inflamed. However, it's not a problem in the day - by 4.00 a.m. it's painful, from the bottom - where the sciatic root is - to the ankle, all down the left side of the thigh and leg. My problem I think, is how I sit in the evenings

Pain relieve by mouth is the quickest way to ease symptoms. When I remember to take 'nurofen' at 9.00 p.m. it isn't bothersome. Also checking footwear ;-). How we sit We may need a new mattress next year .......... 'cos DH sinks into his side

and we can't remember how old it might be.
Before going for a planned walk I take 'nurofen' and the brisk stride helps release the nerve.