Though most occurrences of back pain are directly linked to an injury or abnormality to the discs or vertebrae of the spine, there is the potential that the discomfort you're experiencing is actually owing to some issue involving your prostate. This is largely due to the location of the prostate and the effect it can have on the nerves of your spine when you experience any sort of enlargement of this gland.
One potential culprit of back pain is a condition known as prostatitis. And depending on the type of prostatitis that is affecting your health, the prostate gland may begin to suffer an inflammation. This enlargement not only can obstruct your urethra, causing a change in the frequency, consistency and urgency of urination, but it can also increase pressure within the pelvis, prompting pain to manifest within the lumbar region of your spine (also known as your lower back). However, for prostatitis to be the cause of your lower back pain, you more than likely are experiencing other symptoms of the condition, such as pelvic pain and urinary changes.
Another potential cause of back pain due to your prostate is a bacterial infection. And much like prostatitis, this infection can cause inflammation of your prostate, increasing the pressure within the pelvic region of your body. Typically, the pressure triggers some level of discomfort in your pelvis as well as your perineum, which is the area between your scrotum and anus, but it may also diffuse up into your lower back.
Prostate cancer, especially in later stages of the disease, may be the reason for your back pain. In this situation, pain is ultimately a result of a spinal compression caused by the metastasis of cancerous cells. If cancer progresses into stages III or IV, the abnormal cells associated with the disease are no longer contained within the walls of your prostate. They can begin to invade nearby tissue, such as your spinal cord, and cause the formation of a malignant growth that places pressure on the nerves of your spine.