What Injury Can Cause A Lower Backache?

Hello, I was just wondering. I hurt my lower back maybe a year or two ago and I was in a lot of pain. I m a dancer and I was lifting up my dance partner into the air without stretching and I ve hurt my lower back severely and I couldn t even walk. I was in agony. I never saw a Dr about it as I was scared to be stopped from dancing although I had to stop due to the pain. After about 2 weeks I could walk and slowly bend even though it hurt a lot but before that I couldn t even bend as my back wouldn t let me as well as the pain. It took many months for the pain to go away although often when it s cold outside or if I do any activity the pain comes back although it s not as severe. I was just wondering what injury was it? Just a pulled muscle or something more serious? Thank you very much