Stress usually, or depending on the specific hormones you body produces
Most viral or immune active bio chemicals/enzymes/hormones related diseases.
Diseases that can be transmitted from one organism to another
Hippocrates looked for natural causes to diseases in Ancient Greece
Hormones
thyroid hormones
love
Genes that are inherited from your parents cause inherited diseases.
you get a beard when you go through pubity. it sets of your hormones and so on...
Metatabolic diseases are those that involve a change in the way your body burns fuel. Some metabolic diseases are the result of the thyroid gland and its ability to produce hormones that influence metabolism.
The Pituitary gland.
The hormones that rise and fall.