Hello
I really appreciate your concern for your boyfriend.
Blood in semen and stool is a matter of concern.
Blood in stool might be related to
Fissure in Ano, Hemorroids,
Pilonidal sinus or coagulation disorder and many other causes.
I would advise him for a battery of investigation like CBC particularly hemoglobin to assess amount of blood loss, Liver function test, blood coagulation profile, blood sugar and urine culture test.
In my opinion he should immediately visit an emergency care for physical examination, per rectal or proctoscopy examination to establish a diagnosis.
I would advise him to avoid
constipation by taking laxatives like
liquid paraffin or lactulose 30ml at bed time.
ask him to haveve lots of fluids which will help by flushing off the urogenital tract and clears the mild degree of infection.
Encourage him for stretching exercises and get an MRI done for disc problem.
Please write back to me with all the reports I have advised so that I will be able to tell you more precisely.
Best wishes