Acromegaly is a rare hormonal disorder caused by excess growth hormone in adults. It is characterized by the enlargement and thickening of bones.
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Acromegaly is a distinct medical condition classified under endocrinology, specifically involving the pituitary gland. It is a disorder characterized by the enlargement, thickening, and broadening of bones, particularly in the extremities of the body. The condition arises due to a malfunction in the endocrine system, where the anterior pituitary gland becomes hyperactive. This hyperactivity leads to the hypersecretion of Growth Hormone (GH), also known as somatotropic hormone (STH).
The defining feature of acromegaly is that it occurs in adults after the fusion of the epiphysis (growth plates) with the shaft of the bones. Because the growth plates have closed, the bones cannot grow in length, so they grow in thickness and width instead. This hormonal imbalance affects the structural integrity of the body and alters physical appearance over time.
To understand acromegaly, it is essential to understand the medical specialty of endocrinology. Endocrinology is the study of endocrine glands, which synthesize and release classical hormones directly into the blood. These glands are also called ductless glands because they release their secretions without a duct. Hormones are chemical messengers that act on target cells to produce specific physiological responses.
Metabolic scope: GH acts on the metabolism of proteins, lipids, and carbohydrates.
It is common to confuse acromegaly with other growth disorders, specifically gigantism. While both conditions result from the same hormonal problemtoo much growth, the timing of the disease makes them medically distinct.
Therefore, acromegaly is not simply tallness or rapid growth in height; it is a pathological thickening of bones and tissues in a fully grown adult.
Acromegaly is just one type of disorder related to the anterior pituitary gland. Disorders in this field are generally classified by whether the gland is overactive (hyperactivity) or underactive (hypoactivity).
Simmond’s Disease: Also called pituitary cachexia.
Treating acromegaly often involves a specialized branch of medicine called Neuroendocrinology. Neuroendocrinology is the branch of biology and physiology that studies the interaction between the nervous system and the endocrine system. This field arose from the recognition that the brain, especially the hypothalamus, controls the secretion of pituitary gland hormones.
The hypothalamus and pituitary gland function together as a neuroendocrine system. The hypothalamus regulates the secretion of anterior pituitary hormones by secreting releasing and inhibitory hormones. For acromegaly, this interaction is critical because:
Feedback Loops: In a healthy system, GH secretion is under negative feedback control. In acromegaly, this regulation fails, leading to unchecked hormone production.
Acromegaly is a serious condition because Growth Hormone does not just affect bones; it impacts the entire metabolism. GH acts on the metabolism of the three major types of foodstuffs in the body: proteins, lipids, and carbohydrates.
If left untreated, the continuous high levels of GH can lead to severe metabolic disturbances. For example, GH is a diabetogenic hormone, meaning it increases blood sugar levels. Prolonged hypersecretion can cause the exhaustion of beta cells in the pancreas, potentially resulting in diabetes mellitus. Furthermore, GH stimulates the liver to secrete somatomedin-C (IGF-I), which mediates many of the growth effects.
Organ Function: GH affects almost all tissues capable of growing, meaning untreated acromegaly puts stress on internal organs.
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Specialists in this field treat disorders arising from the hyperactivity of the anterior pituitary gland. Specifically, they manage acromegaly, which is the enlargement and thickening of bones in extremities, and related metabolic complications.
Specialists in this field treat disorders arising from the hyperactivity of the anterior pituitary gland. Specifically, they manage acromegaly, which is the enlargement and thickening of bones in extremities, and related metabolic complications.
The main types include Gigantism (excess growth in children), Acromegaly (bone thickening in adults), Acromegalic Gigantism (a combination of both), and Dwarfism (stunted growth due to GH deficiency).
You should see a specialist if you notice abnormal enlargement, thickening, or broadening of bones, particularly in the extremities (hands, feet, jaw) during adulthood. These are classic signs of acromegaly caused by continued GH hypersecretion after bone fusion.
Gigantism occurs in children due to hypersecretion of GH before the fusion of the epiphysis (growth plates) with the bone shaft, leading to extreme height. Acromegaly occurs in adults after the epiphysis has fused, causing bones to thicken rather than lengthen.
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