Hello and welcome to HCM. Thank you for your query. I have gone through your query, and would like to start of by speaking about your SPD (symphysis pubis dysfunction). The only reason why most women are diagnosed with SPD during pregnancy is because the pelvis is directly involved with birth. But SPD can present in women who are not pregnant as well, this is mainly because SPD involves a misalignment of the pelvis, due to which it can put pressure on surrounding structures, especially the spinal cord, which is very sensitive and can easily result in pain (even severe at times). I highly doubt this could be related to cancer. But for your satisfaction, why don t you go ahead with an ultrasound of the pelvis and abdomen and a transvaginal ultrasound (TVS), which will help in superficial suspicion of any such abnormalities. You can also follow this up with an x-ray of the lumbar spine and pelvis, which will ensure that the position of your pelvis is what is causing your presentation. Do not worry, I can understand your anxiety, but once SPD is confirmed as the cause, wearing lumbar and pelvic support belts will surely help you, along with some help from a physiotherapist. Wishing you a symptom-free life. I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://doctor.healthcaremagic.com/doctors/dr-shoaib-khan/64581 . I would gladly help you. Best wishes.