https://en.m.wikipedia.org/wiki/Gigantism
Gigantism, also known as giantism (from Greek γίγας, gígas, "giant", plural γίγαντες, gígantes), is a condition characterized by excessive growth and height significantly above average. In humans, this condition is caused by over-production of growth hormone[1] in childhood resulting in people 7 to 9 ft (2.1 to 2.7 m) in height.[
https://en.wikipedia.org/wiki/Dwarfism
Dwarfism, also known as short stature, occurs when an organism is extremely small.[1] In humans, it is sometimes defined as an adult height of less than 147 centimetres (4 ft 10 in), regardless of sex, although some individuals with dwarfism are slightly taller.
The words midget and dwarf both refer to people who are shorter than what is typical. The main difference between a midget and a dwarf is that a midget has normal bodily proportions. Since the term "midget" is considered offensive, the term "little person" can be used to refer to a midget or a dwarf.
Midget is a derogatory name for a person who is unusually small but well-proportioned. The term has given way to the more favorable "little person." Little people (or midgets) do not suffer from the same bone and joint problems as people with dwarfism. They grow normally, but do not exceed 58 inches in height.
A dwarf is an unusually small person (less than 58 inches tall) with abnormal bodily proportions. Dwarfism is the result of a variety of genetic conditions. It can affect people, animals, and plants. People with dwarfism can suffer bone and joint problems as well as nerve compression.
Both acromegaly and gigantism are caused by a typically benign tumor or adenoma in the pituitary gland. That tumor causes excess growth hormone production, resulting in various symptoms such as abnormal height in children, coarse facial features, excessively large hands and feet, thick fingers and more.
Marfan syndrome This is an inherited connective tissue disorder with characteristic skeletal, dermatological, cardiac, aortic, ocular and dura mater malformations. Although it is a severe, chronic and life-threatening disease, most patients with Marfan's syndrome (MFS) who receive optimal medical care now have a near-normal life expectancy.