If i have a burning/aching sensation in my lower left abdomen (feels bowel related) and i've had it before for weeks a few months back. it just came back after months of being symptom free. what could it be? diverticulitis? been inactive recently?

Any change in bowel movements? mucus? Swollen lymph nodes? May be inflammatory bowel , or even kidney stone( though that is usually very painful) , possible STD ( how long inactive? or hernia . Would follow up with Md for urine test, physical exam, CBC, CMP- metabolic profile, possible imaging.

Just from this description alone it is impossible to pinpoint the cause of the pain. Since the pain is now recurrent, I would make an appointment to see your primary doctor or a G.I. doctor for tests to evaluate for causes. Good luck.