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Thyrotoxic myopathy is usually diagnosed by a neurologist who has extensive experience diagnosing neuromuscular disorders. There are many types of neuromuscular disorders that present similar physical symptoms. Extensive clinical tests are performed first to determine if there is a neuromuscular disorder and then to determine which disorder it is.
Thyrotoxic periodic paralysis (TPP) is a rare condition featuring attacks of muscle weakness in the presence of hyperthyroidism (overactivity of the thyroid gland). Hypokalemia (a decreased potassium level in the blood) is usually present during attacks.
(G72.0) Drug-induced myopathy Glucocorticoid myopathy is caused by this class of steroids increasing the breakdown of the muscle proteins leading to muscle atrophy. [6] (G72.1) Alcoholic myopathy (G72.2) Myopathy due to other toxic agents - including atypical myopathy in horses caused by toxins in sycamore seeds and seedlings. [7] [8] (M33.0-M33.1)
Thyroid storm is a rare but severe and life-threatening complication of hyperthyroidism.It occurs when an overactive thyroid leads to hypermetabolism, which can cause death from cardiac arrest or multiple organ failure.
Thyrotoxicosis factitia (alimentary thyrotoxicosis, exogenous thyrotoxicosis) [1] [2] is a condition of thyrotoxicosis caused by the ingestion [3] of exogenous thyroid hormone. [4] [5] It can be the result of mistaken ingestion of excess drugs, such as levothyroxine [6] and triiodothyronine, [7] or as a symptom of Munchausen syndrome.
Neuromuscular disease can be caused by autoimmune disorders, [1] genetic/hereditary disorders [2] and some forms of the collagen disorder Ehlers–Danlos syndrome, [12] exposure to environmental chemicals and poisoning which includes heavy metal poisoning. [3]
Myxedema (British English: myxoedema) is a term used synonymously with severe hypothyroidism.However, the term is also used to describe a dermatological change that can occur in hypothyroidism and (rare) paradoxical cases of hyperthyroidism.
[4] [5] Similar to subacute granulomatous thyroiditis, there is an initial transient thyrotoxic phase that can last 2-5 months followed by a hypothyroid phase. Thyrotoxic symptoms are usually mild and in some individuals, the hypothyroid phase is the only symptomatic phase.