During the summer, many people experience fatigue, difficulty concentrating, low energy or swelling due to prolonged periods of hot weather. However, these symptoms cannot always be attributed solely to the heat. In some cases, an underactive thyroid may also be contributing to the symptoms.
Thyroid hormones play a key role in regulating metabolism, energy use and body temperature. When thyroid hormone production decreases, the body may switch to a “slower mode”: exercise tolerance may decrease, temperature regulation may become less efficient, and fatigue, fluid retention and mental sluggishness may become more pronounced. Although hypothyroidism is classically associated with increased sensitivity to cold, some people with reduced thyroid function may also find hot weather more difficult to tolerate because the body’s ability to adapt to temperature changes may be reduced.
Identifying the condition can be challenging because several symptoms of hypothyroidism can resemble those caused by hot weather. Fatigue, low energy, swelling of the limbs, slower thinking and weight gain may easily be regarded as normal during the summer, particularly during prolonged heatwaves. However, if these symptoms persist or also occur outside the summer months, laboratory testing may be advisable.
Many people have only their TSH level checked, but this alone does not always provide a complete picture of thyroid function. A more comprehensive assessment may include measurements of free T3 and free T4, as well as thyroid antibodies such as anti-TPO, which may indicate autoimmune thyroiditis. A complete blood count and electrolyte testing, including sodium, chloride, potassium, calcium and magnesium, may also provide useful information, as heat exposure and metabolic abnormalities can contribute to symptoms simultaneously.
An accurate diagnosis is important because persistent fatigue and reduced performance may not simply be the result of temporary summer exhaustion. They may also indicate a hormonal imbalance that requires treatment. Book an appointment at HR-Pharma, your laboratory service provider in Szeged.
Frequently Asked Questions
Is summer fatigue always caused by hot weather?
No. Heat alone can cause fatigue and exhaustion, but if symptoms persist or recur, a hormonal imbalance may also need to be considered.
Is a TSH test alone sufficient?
Not in every case. Free T3, free T4 and anti-TPO testing can provide a more comprehensive picture of thyroid function.
What symptoms may indicate an underactive thyroid?
Fatigue, difficulty concentrating, a slower metabolism, weight gain, fluid retention, dry skin and increased sleepiness may all be associated with hypothyroidism.
When should I consider having further tests?
If fatigue, weakness or swelling persists for several weeks or cannot be explained solely by hot weather, further laboratory testing may be advisable.