@hello1234 There is a lot of good info on this site:
https://www.emedicinehealth.com/what_triggers_sciatica/article_em.htm
including this:
Triggers for sciatic nerve pain include:
"Sitting too much
Being overweight/obese
Wearing high heels or uncomfortable/uncushioned shoes
Wearing overly tight, form-fitting pants, shorts, or skirts
Carrying bulky items in a back pocket, such as wallets and phones"

I strongly suspect my current flare has to do with sitting too much. I've been trying to Christmas shop on the computer.
JK