Hello, As per my clinical experience, the discomfort while in certain position when standing and relief when riding bicycle indicates possible issue underlying related to some sort of nerve compression at lower spinal (lumbar) cord level most likely. There can be underlying spinal stenosis, more concerned to right side of the vertebral column involving half of the spinal canal and that can be prominent reason for said symptoms. An MRI lower lumbar region is of paramount importance in the diagnosis of this issue and manage accordingly. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Bhagyesh V. Patel, General Surgeon