I am 22 year old male and I am suffering from lower left back pain. I experience this pain in 2019. At that time this pain had gone in some days. So I thought this may caused because of some heavy work. After some month. When I return from school. Again I witness this pain in same place in my body. Again the pain goes after some day. During lockdown. I started to notice that. I have mild pain in lower back side which is now persistent and whenever I do some physical activity which create pressure on lower back increase my pain immensely. Now a days. It become worse. I did not go to gym and do exercise in my home. So please tell me what is reason behind this pain and what should I do?