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Thyroid disorders can cause muscle problems, including twitching and pain. Hypothyroidism, or an underactive thyroid, can lead to muscle weakness, fatigue, and in rare cases, Hoffman's syndrome, a rare form of hypothyroid myopathy. On the other hand, hyperthyroidism, or an overactive thyroid, can cause muscle weakness throughout the body and, in rare cases, affect the muscles used for swallowing and breathing. Both conditions can be treated with medication and, in some cases, surgery.
| Characteristics | Values |
|---|---|
| Condition | Overactive thyroid (hyperthyroidism) |
| Thyroid hormones | Increased activity |
| Muscle involvement | Muscle weakness, aches, and cramping |
| Muscle fibers | Shift from fast-twitch (Type II) to slow-twitch (Type I) fibers |
| Muscle function | Impaired, affecting strength and coordination |
| Muscle energy | Increased use |
| Muscle protein | Increased breakdown |
| Treatment | Addressing the underlying thyroid disease |
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What You'll Learn
Hypothyroid myopathy
The symptoms of hypothyroid myopathy can be gradual and nonspecific, ranging from mild to severe. Mild symptoms include weakness, pain, aching, and stiffness. Severe symptoms can include muscle necrosis, acute compartment syndrome, or respiratory failure. Proximal muscles such as thighs, hips, shoulders, and neck are commonly affected, impacting activities such as climbing stairs, rising from a seated position, and lifting objects. Hypothyroid myopathy can also cause muscle spasms after exercise, myalgia, and muscle stiffness. In rare cases, it can result in muscle hypertrophy, which is an enlargement of the muscles along with muscle weakness.
Hoffman's syndrome is a rare form of hypothyroid myopathy, causing proximal weakness and pseudohypertrophy of muscles. It was first described in 1897 in an adult who developed muscle stiffness and difficulty relaxing muscles after thyroidectomy. Similar presentations in children with cretinism are referred to as Kocher-Debré-Sémélaigne syndrome.
The risk of hypothyroidism is higher in patients with myotonic dystrophy, and the true prevalence of neuromuscular complications during hypothyroidism may be underestimated. Hypothyroid myopathy can be almost completely alleviated by restoring normal thyroxine levels through medication or surgery.
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Hyperthyroid myopathy
The overproduction of thyroid hormones, known as thyroxine, leads to an increase in metabolism. This can cause the body to break down muscle tissue faster than it can be replaced, resulting in muscle weakness. Additionally, hyperthyroidism can cause difficulty sleeping, which may lead to muscle weakness as the body doesn't get adequate rest to recover from daily stress. The exact link between hyperthyroidism and myopathy is unknown.
The most common symptoms of hyperthyroidism include unintentional weight loss, sweating, irritability, and heart palpitations. In some cases, hyperthyroidism can lead to a loss of muscle control along with muscle pain and stiffness, known as hyperthyroid myopathy. The best treatment for hyperthyroid myopathy is usually in line with the overall hyperthyroidism treatment plan, which may include medication or surgery to manage hormone levels.
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Hoffman's syndrome
The exact cause of muscle hypertrophy in Hoffman's syndrome is not well understood, but it may be due to altered carbohydrate metabolism, mucoid deposits, or glycosaminoglycan deposits. The syndrome can be diagnosed through a muscle biopsy, which reveals atrophy of type II (fast-twitch) muscle fibres and a predominance of type I (slow-twitch) muscle fibres, as well as abnormally high glycogen accumulation.
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Muscle weakness
In hypothyroidism, the underactive thyroid gland results in reduced thyroid hormone levels, which are crucial for metabolism, growth, and organ function. This hormone deficiency impairs normal cellular functions, including a reduction in muscle mitochondrial oxidative capacity and beta-adrenergic receptors. As a result, people with hypothyroid myopathy typically experience muscle weakness in the larger muscles of the body, such as the shoulders, thighs, hips, and neck. This weakness can interfere with daily activities like climbing stairs, rising from a seated position, and lifting objects.
On the other hand, hyperthyroid myopathy causes muscle weakness throughout the body. While muscle cramps and aches are less common in hyperthyroidism compared to hypothyroidism, muscle weakness is still a prominent symptom. People with hyperthyroid myopathy may also experience weakness in the throat, face, and respiratory muscles, although this is rare.
The treatment for muscle weakness associated with thyroid disease involves addressing the underlying thyroid condition. For hypothyroidism, thyroid hormone replacement medication like Synthroid (levothyroxine) is typically prescribed, while hyperthyroidism requires different treatments to manage the overactive thyroid. In both cases, it may take several months for muscle weakness to improve, even after the thyroid function has normalised.
In severe cases of hypothyroid myopathy, a rare condition called Hoffman's syndrome may develop, causing proximal weakness and pseudohypertrophy of muscles. Surgical procedures like selective denervation may be considered as a last resort to treat Hoffman's syndrome if conservative treatments have been ineffective.
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Muscle disease
Hypothyroid Myopathy
Hypothyroid myopathy is a skeletal muscle disease caused by hypothyroidism. It is observed in 30% to 80% of individuals with hypothyroidism and can manifest with symptoms such as generalized myalgias, muscle weakness, and muscle pain or stiffness. The proximal muscles, such as those in the thighs, hips, shoulders, and neck, are particularly affected, impacting activities such as stair climbing, rising from a seated position, and lifting objects. In rare cases, hypothyroid myopathy can lead to periodic paralysis.
The exact cause of hypothyroidism-induced myopathy is not known, but it is believed that a thyroxine (T4) deficiency leads to muscle injury and impaired muscle function. The muscle involvement in hypothyroidism is caused by alterations in muscle fibers from fast-twitching type II to slow-twitching type I fibers, deposition of glycosaminoglycans, poor contractility of actin-myosin units, low myosin ATPase activity, and low ATP turnover in skeletal muscle.
Hyperthyroid Myopathy
People with hyperthyroid myopathy may experience weakness in the throat, face, and respiratory muscles, and rarely, in the muscles that control swallowing and breathing. The causes of myopathy with hyperthyroidism are not well understood, but it is suggested that high thyroid hormone levels may lead to an increased breakdown of muscle protein and greater muscle energy use.
Diagnosis and Treatment
The diagnosis of hypothyroid and hyperthyroid myopathy is based on symptoms, physical examination, and diagnostic tests. Blood tests, such as a thyroid function panel and creatinine kinase level measurement, are commonly performed. Other tests may include electromyography and muscle biopsy in more severe or unclear cases.
Treatment of the underlying thyroid disorder can help ease the symptoms of both hypothyroid and hyperthyroid myopathy. For hypothyroidism, thyroid hormone replacement medication, such as Synthroid (levothyroxine), is usually effective in improving symptoms. In severe cases of Hoffman's syndrome, a rare form of hypothyroid myopathy, surgery may be considered to selectively weaken or remove overactive muscles. Adopting a healthy, well-balanced diet rich in essential nutrients, vitamins, iodine, and selenium can also support thyroid function.
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Frequently asked questions
Yes, an overactive thyroid or hyperthyroidism can cause muscle twitching or myopathy. This is caused by increased breakdown of muscle protein and greater muscle energy use.
People with hyperthyroid myopathy may experience weakness in the throat, face, and respiratory muscles. In rare cases, it can also affect muscles that help with swallowing and breathing.
The exact cause of hyperthyroid myopathy is not well understood. However, it is believed that high thyroid hormone levels may lead to increased breakdown of muscle protein and greater muscle energy use.
Treatment of the underlying thyroid disease can help improve the symptoms of hyperthyroid myopathy. This may include medication such as thyroid hormone replacement therapy or, in severe cases of Hoffman's syndrome, surgery to weaken or remove overactive muscles.
