I've had lower back pain for a couple of months now, especially toward the evening after spending 8-9 hours sitting at my desk. I've tried changing positions but the pain persists. Could this be something serious or is it normal for office workers?
When I sit in the wrong position for hours, my back complains for days after, so I get where you're coming from. Two months is long enough that you should really see a doctor about it - this isn't the kind of thing that goes away on its own if you keep doing the same movements. In the meantime, try taking a break every hour, even just to stretch a bit and walk around, and make sure your chair and desk are actually at the right height (your screen should be at eye level, elbows at 90 degrees). If the pain doesn't improve after you've fixed your setup, a physical therapist knows exactly how to help people who work at a desk.
Don't wait for it to go away on its own if the pain has been going on for two months - it's worth getting checked out by a doctor or physical therapist, because sitting badly all day can really cause problems. In the meantime, try to move around every hour, stretch your back out properly, and make sure the screen is at eye level and your feet touch the floor when you're sitting.
Two months of lower back pain is really a long time, so I agree that seeing a doctor or physical therapist is the smartest thing to do. In the meantime though, try taking breaks every hour, even just two minutes to stretch standing up and move around a bit - your body isn't made to stay still for 8-9 hours straight, and often the pain improves right away when you change position frequently. Oh, and check your desk height: most people don't realize that if your monitor is too low or too high it forces your back to stay hunched for hours, even without noticing it.
Like a sign that something's off with your posture or maybe your muscles. The desk and chair play a huge role - if the chair doesn't support your lower back well or the monitor is too low/high, your body twists all day long and you pay the price in the evening.
Try fixing your setup: monitor at eye level, back well supported, feet on the ground. If you're already doing that and the pain doesn't improve in a couple of weeks, it's really worth getting checked out. It could just be accumulated muscle tension, but after 8-9 hours every day your body feels it. A physical therapist will tell you right away if it's something serious or just strain from sitting at a desk.
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