I had a seminoma cancer. i got my semen's analysis done but there was no sperm ( azospermia). can you please tell me if i'm having azosperia because of cancer?

Not sure: That is entirely possible. However there could be scarring inside the testicle that blocks sperm from getting outside. It would be appropriate to have some blood testing done and an exam with a urologist to get a better sense of what is going on. It is possible there are sperm inside but need surgical extraction rather than release by ejaculation.

Chemo?: Seminoma can be treated with chemo and radiation. If you had chemo, you may be infertile for a couple of years and sometimes permanently. Radiation can cause damage to the remaining testicle but it's usually left out of the radiation field. You need a male fertility specialist.

Men with testis: Cancer often have low sperm counts, which blocks the concept of banking for some, but it is not clear that the cancer is the cause (usually nothing wrong with the testis on the other side) and some attribute to anesthetic. Truthfully, no well understood.