Hashimoto’s disease, also known as chronic lymphocytic thyroiditis, is an autoimmune condition in which the immune system mistakenly attacks the thyroid gland. Over time, this immune response leads to inflammation and gradual damage of the thyroid, often resulting in hypothyroidism (an underactive thyroid).
The thyroid is a small, butterfly-shaped gland located at the front of the neck. It plays a critical role in regulating metabolism, energy levels, body temperature, heart rate, and many other bodily functions through the release of thyroid hormones. In Hashimoto’s disease, white blood cells accumulate in the thyroid, impairing its ability to produce adequate hormones.
Hashimoto’s is the most common cause of hypothyroidism in developed countries, including Australia. It affects women far more commonly than men and is most often diagnosed between the ages of 30 and 50, although it can occur at any age.
While Hashimoto’s disease is not a musculoskeletal condition, its effects on energy levels, muscle strength, joint health and overall wellbeing mean that physiotherapy can play a supportive role in symptom management, physical conditioning and quality of life.
Key Facts
- Hashimoto’s disease is the most common cause of hypothyroidism in iodine-sufficient countries. 🔗
- Women are significantly more likely than men to develop Hashimoto’s disease, often between 30 and 50 years of age.
- Autoimmune thyroid disease commonly leads to hypothyroidism due to progressive thyroid gland damage. 🔗
Risk Factors
- Family history of thyroid disease or other autoimmune conditions.
- Female sex.
- Presence of other autoimmune disorders such as coeliac disease or type 1 diabetes.
- Excessive iodine intake.
- Previous radiation exposure to the neck.
Symptoms
- Persistent fatigue and low energy levels.
- Weight gain despite no significant change in diet or activity.
- Increased sensitivity to cold temperatures.
- Constipation.
- Dry, coarse skin and hair thinning or hair loss.
- Low mood, depression or anxiety.
- Memory difficulties or ‘brain fog’.
- Menstrual irregularities or fertility issues.
- Muscle weakness, cramps or generalised aches.
- Swelling at the front of the neck due to goitre.
- Slowed growth or delayed puberty in children.
Aggravating Factors
- Prolonged physical or emotional stress.
- Poor sleep quality.
- Sedentary lifestyle or deconditioning.
- Periods of hormonal change such as pregnancy or menopause.
Causes
Hashimoto’s disease is an autoimmune condition in which the immune system targets thyroid tissue. This leads to chronic inflammation and progressive destruction of thyroid cells, reducing hormone production over time.
The exact trigger is not fully understood, but it is thought to involve a combination of genetic susceptibility and environmental factors. Excess iodine intake, infections, stress and radiation exposure may act as triggers in vulnerable individuals.
How Is It Diagnosed?
Hashimoto’s disease is diagnosed through a combination of clinical history, physical examination and blood tests. Because symptoms develop slowly and overlap with many other conditions, laboratory testing is essential.
Diagnosis typically involves measuring thyroid-stimulating hormone (TSH) and thyroid hormone levels (T3 and T4). Elevated TSH with low thyroid hormone levels suggests hypothyroidism. The presence of thyroid antibodies supports a diagnosis of Hashimoto’s disease.
Ultrasound imaging may be used to assess thyroid size and detect inflammation, particularly in early or uncertain cases.
Investigations & Imaging
- Blood tests (TSH, T3, T4)
- Assess thyroid function and identify hypothyroidism.
- Thyroid antibody testing
- Detects antibodies associated with autoimmune thyroid disease.
- Thyroid ultrasound
- Identifies inflammation or structural changes in the thyroid gland.
Grading / Classification
- Euthyroid phase
- Normal thyroid hormone levels despite presence of thyroid antibodies and minimal or no symptoms.
- Subclinical hypothyroidism
- Elevated TSH with normal thyroid hormone levels; symptoms may be mild or absent.
- Overt hypothyroidism
- High TSH with low thyroid hormone levels and clear symptoms.
- Atrophic thyroiditis
- Advanced stage with a shrunken, poorly functioning thyroid.
Physiotherapy Management
Physiotherapy management for Hashimoto’s disease focuses on addressing the physical consequences of hypothyroidism, including fatigue, muscle weakness, reduced exercise tolerance and general deconditioning. Physiotherapy complements medical management and supports long-term health and wellbeing.
Exercise
Exercise programs are typically low to moderate intensity and progressed gradually. Aerobic exercise and light resistance training can improve energy levels, muscle strength, mood and metabolic health.
Physiotherapists tailor exercise to fatigue levels, ensuring adequate recovery and avoiding symptom flare-ups.
Activity Modification
Activity modification and pacing strategies help individuals manage fatigue and avoid overexertion. Physiotherapists assist with balancing activity and rest.
Education
Education focuses on energy conservation, safe progression of activity, and understanding how hypothyroidism affects physical performance.
Other
Other strategies may include postural exercises, gentle mobility work for stiffness, and guidance on returning to regular physical activity once thyroid levels are stabilised.
Other Treatments
Medical management is the cornerstone of Hashimoto’s disease treatment and typically involves lifelong thyroid hormone replacement with levothyroxine. Regular blood tests are used to monitor hormone levels and adjust medication dosage.
Prognosis & Return to Activity
Hashimoto’s disease is a lifelong condition, but with appropriate medical treatment most people can live normal, healthy lives. Early diagnosis and effective hormone replacement significantly reduce the risk of complications.
Physiotherapy can support physical conditioning, reduce fatigue and improve overall quality of life.
Complications
- Cardiovascular disease if hypothyroidism is poorly managed.
- Goitre progression.
- Myxedema, a rare but severe form of hypothyroidism.
- Fertility and pregnancy complications.
Preventing Recurrence
- Adhere to prescribed thyroid hormone replacement therapy.
- Maintain regular physical activity with physiotherapy guidance.
- Manage stress and prioritise adequate sleep.
When to See a Physio
- Persistent fatigue or muscle weakness affecting daily activities.
- Difficulty returning to exercise after diagnosis.
- General deconditioning or low exercise tolerance.