A history of testicular symptoms, injury, or surgeries, as well as genetic conditions like klinefelter syndrome , may increase your chances of having a low sperm count. Cancer treatments, including chemotherapy, radiation, or surgery, may also affect hormone and sperm production. Radiation of the testicles directly damages the cells that produce sperm, while radiation or surgery of the brain can likewise cause low sperm count, as hormones produced in the brain stimulate sperm production. Other possible causes include: swelling in the veins that drain the testicles, which is called varicocele and one of the most common causes of male infertility

What causes weak ejaculation?

it may surprise you to hear that having sex or masturbating frequently won’t reduce your sperm count. It’s a myth that you have to “save” your sperm. Infrequent sex might lead to larger ejaculations that look like they’d have a higher sperm count, but that’s deceptive. Every time you ejaculate, you remove defective sperm. Regularly getting rid of weak sperm means the sperm you have left is strong and healthy.