Frank, Thank you for your reply.
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Having blood in the semen has a variety of different causes, most of them are not serious and easily reversible.
The most likely cause of blood of blood in the semen is infection in the prostate, called prostatitis. It will also explain the shooting pain you are experiencing under the scrotum. Prostatitis is easily diagnosed with a urine test and is treated with antibiotics.
Bladder infection can also cause blood in semen. Bladder infection in men most often causes no symptoms of pain upon urination or urinary frequency but again, a urine test, will show if there infection present.
Some other causes include enlarged prostate which we often seen in men as they get older, trauma to the prostate (from the recent fall you had). Rarely prostate cancer or bladder cancer can cause blood in the semen.
So as you can see there are several reasons for having blood in the semen. You will need further evaluation, preferably by a urologist. Besides getting your PSA checked (which you are waiting the results on), you also need to have a urine test as well as a rectal exam to feel your prostate.
Again, good news is most often the causes of bloody semen is nothing serious and is easily treated.
I hope you find this information helpful. Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,