 [ Symptoms ] does niacin cause cancer  i have started taking niacin to increase my hdl for the last 3 months i have taken 400mg a day and had 1 beer a day both were things i found on several wed sites to increase hdl most other things listed i was already doing my hdl was 37 and after 3 months it was 42 i was planning on stopping the beer a day and continuing the niacin to see which was causing the improved results then a co worker said he was told niacin can cause cancer [ Disease ] hi there are a lot of possibilities but you have to be more specific where exactly is the pain what increase the pain and what relieves it is there numbness in your lower limb which one upper limb that may be a kind of lumbago or simply some disc lesions in your middle or lower back which can be confirmed with mri and xrays…please reply with the answers…