Had an esi lumbar steroid injection...over a week later and still getting severe nights sweats...is this common, how long will it last?

Not common: I have had occasional patients report some flushing and night sweats after epidural injection. If they continue or become assiciated with fevers, chills, weakness, or headaches, please contact your doctor immediately to make sure you are fine.

Steroid epidural: 10% of the patients may experience side effects of the steroid and not of the epidural space injection perse. These side effects are sleeplessness, lethargy, drowsiness, headaches, mood swings, night sweats, temporary increase in appetite, temporary increase in blood glucose levels (attention diabetic patients), fluid retention. They last 3 days- to 35-40 days. Pain and fever warrants emergency room.

Yes: Unfortunately this is a known side effect. Hopefully it will pass in a few weeks at the most. Once the steroid is out of your body it will be gone. If you need a repeat injection ask your doctor to switch the steroid, sometimes this helps or consider non-steroidal injections, although this may give you less relief and will need repeat injections.