Stress usually, or depending on the specific hormones you body produces
Hormones cause a physiological effect on the body. While the mind is trying to function, the body is changing, and that causes confusion.
Hormones
thyroid hormones
you get a beard when you go through pubity. it sets of your hormones and so on...
The Pituitary gland.
The hormones that rise and fall.
change in hormones levels
The hormones that stop your period are estrogen and progesterone. Estrogen causes bloating, mood swings and headaches while progesterone causes acne, fatigue and tender breasts.
Thyroid stimulating hormone or TSH.It is secreted by anterior pitutory
because our hormones build and we have to have weird orgasms
sleep, growth hormones, eating right, etc.
It is usually genetic, and hormones can play a role.