<s>[INST] My husband was diagnosed with advanced prostate cancer a year ago. He was immediately put on hormone treatments. I now notice that he is beginning to sleep a lot during the day. He constantly have severe lower back pain and just feels fatigued throughout the day. Is this normal. [/INST] Hi, dairy have gone through your question. I can understand your concern.  He has prostate cancer.  Prostate cancer is prone for bone metastasis.  His back pain may be due to metastatic carcinoma in spine. He should go for MRI of spine.  It will give you exact diagnosis. Then he should take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. </s>