A differential diagnosis for acromegaly includes the following:
1. Gigantism: This is an extreme form of growth hormone excess that often occurs in childhood and adolescence. It is typically caused by a tumor of the pituitary gland that produces excessive growth hormone.
2. Cushing’s Syndrome: This is a condition caused by the excessive production of the hormone cortisol. Symptoms include weight gain, thinning skin, purple stretch marks, muscle weakness, and thinning hair.
3. Hyperthyroidism: This is an overproduction of the thyroid hormone from the thyroid gland, which can cause a variety of symptoms including fatigue, weight loss, increased appetite, anxiety, and irritability.
4. Hypopituitarism: This is an underproduction of hormones from the pituitary gland, which can cause a variety of symptoms such as fatigue, weight loss, and infertility.
5. Hypothyroidism: This is an underproduction of the thyroid hormone from the thyroid gland, which can cause a variety of symptoms including fatigue, weight gain, dry skin, constipation, and depression.
6. Hypothalamic dysfunction: This involves a disorder of the hypothalamus, which can cause a variety of symptoms including fatigue, weight gain, and changes in mood.
7. Multiple endocrine neoplasia type 1 (MEN1): This is an inherited disorder caused by a mutation in the MEN1 gene, which can cause a variety of symptoms including acromegaly, hyperparathyroidism, and hypoglycemia.
8. Neurofibromatosis type 1 (NF1): This is an inherited disorder caused by a mutation in the NF1 gene, which can cause a variety of symptoms including learning disabilities, acromegaly, and benign tumors of the skin.
9. Craniopharyngioma: This is a benign tumor of the pituitary gland, which can cause a variety of symptoms including acromegaly, vision problems, and diabetes insipidus.
10. Tumors of the pancreas or other organs: These are rare but can cause acromegaly if they secrete excessive amounts of growth hormone.