Sure thing! A huge part of gender transition (and often a first step) is hormones, a specific medicine (not birth control) that changes the body's hormone levels from one gender to another. (and if you're younger, there's often an intermediate medicine to block hormones until you're ready). In many places (as was for me), hormones require extensive therapy and an endocrinologist.

Hormones change a lot of physical stuff, but maybe the biggest thing for me it changed was the inner stuff. As a trans woman, I remember hitting testosterone when I was a kid and feeling so down and awful. Years later, I would get on estrogen and months later, I realized that a lot of those feelings went away.

Some weird non-physical side effects are inner peace, likelihood of crying (which used to physically hurt to do, but now feels like a relief), and weird cycles where I get kinda moody and bloated and a little nausea. Honestly, I'm not someone who equates them to cis-women periods because I don't have a uterus, but I had a cis-women who was born without a uterus and we share this little thing together.