Most common reason we get back pain is bad posture and prolonged sitting due a desk job.My advice is to make sure that your chair , your desk and computer are all at an appropriate level so that you don't slouch or have strain your back and neck.There are some good videos available in the net (you tube) about good posture.
Next Steps
Always consult an orthopaedic surgeon to rule out other causes of back ache. Take an X-ray of you back and neck
Health Tips
Never delay your consultation if your back pain is becoming worse or you started getting leg or thigh pain