how can steroids effect the body chemically?

Answer 1

They are artificial hormones. By altering the level of hormones in your body you throw your metabolism off balance. Your body will respond to this unbalanced condition by either producing counter offensive hormones or by producing materials which have an effect on your physical health (heart) and mental well-being (serotonin).

Answer 2

Anabolic Steroids
A steroid is a chemical substance derived from cholesterol. The body has several major steroid hormones -- cortisol and testosterone in the male, estrogen and progesterone in the female. Catabolic steroids break down tissue, and anabolic steroids build up tissue. Anabolic steroids build muscle and bone mass primarily by stimulating the muscle and bone cells to make new protein.

Athletes use anabolic steroids because they increase muscle strength by encouraging new muscle growth. Anabolic steroids are similar in structure to the male sex hormone, testosterone, so they enhance male reproductive and secondary sex characteristics (testicle development, hair growth, thickening of the vocal cords). They allow the athlete to train harder and longer at any given period.

Anabolic steroids are mostly testosterone (male sex hormone) and its derivatives. Examples of anabolic steroids include:

Testosterone
Dihydrotestosterone
Androstenedione (Andro)
Dehydroepiandrosterone (DHEA)
Clostebol
Nandrolone
These substances can be injected or taken as pills. Anabolic steroids have a number of possible and well-known side effects, including:
Jaundice and liver damage because these substances are normally broken down in the liver
Mood swings, depression and aggression because they act on various centers of the brain
In males, the excessive concentrations interfere with normal sexual function and cause:

Baldness
Infertility
Breast development
In females, the excessive concentrations cause male characteristics to develop and interfere with normal female functions. The drugs can:

Stimulate hair growth on the face and body
Suppress or interfere with menstrual cycle, possibly leading to infertility
Thicken the vocal cords, which causes the voice to deepen, possibly permanently
If pregnant, interfere with the developing fetus

Not sure if this is what your looking for but there is some information here.

Answer 3

Mood swings of rage would equal a chemical imbalance