What are testicular atrophy symptoms? how it feels like?

Small balls . . .: Testicular atrophy refers to small balls, literally. Question to ask is why? They can shrink from excessive doses of testosterone or other anabolic steroids. But then, aside from small balls, you wouldn't notice anything else since you're taking T/steroids. On the other hand, if testes are small b/c pituitary or hypothalamic issue, then you might notice hypogonadism (low T) & infertility.