<s>[INST] I had a baby four and a half months ago and started getting back pain shooting down my leg have been diagnosed with a sciatica, i am mobile but struggle to bend and get up and down from being seated however have noticed a little lump on same side between my thigh and bum cheek i didn t know if this was related to the trapped nerve as i have to wait two weeks for physio. [/INST] Hi, I had gone through your question and understand your concerns. The sciatic nerve compression is a common finding in pregnancy, due to the weigh gain and change in the body position with the back pushed forward. Basically, the lumbar pain orientates towards a lumbar origin of the sciatica, while the lump you describe is somewhere on the passage of the sciatic nerve leading to a local compression cause. I would recommend a consult to your primary care doctor to palpate on this lump and of course a diet on loosing weigh because overweight is related to all causes of sciatica. Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health. </s>