If you're talking height and giantism its too much human growth hormone from your pituitary.
If you're talking obesity not related to sedentary life style and over eating its too little thyroxine from your thyroid aka hypothyroidism
Overproduction of human growth hormone (HGH) in the pituitary gland during childhood leads to gigantism, as it stimulates cell reproduction and regeneration.
Causes abnormally large bumps on neck
Gigantism is abnormally large growth due to an excess of growth hormone during childhood, before the bone growth plates have closed.
is south African government abnormally large or its role should be increased
Macroagnathia is an abnormally large jaw.
Even though I was young, I was large in "stature"
Gigantism takes place when a pea sized gland under the brain known as the Pituitary gland produces a very large amount of Growth Hormone resulting in excess extreme growth and thus abnormally large stature One example was Robert Wadlow: 8 foot 11.1 inches
No, it is an adverb. It means "in a way that is not normal or common." It is often used with a connotation of "excessively" (e.g. abnormally large).
It usually refers to someone of a large stature.
Megacolon
an AFL footballer with an abnormally large chin.
Macrotia
One eye of hers had an abnormally large eyelash.