- Allergy self-tests
- Blood group self-tests
- Check-up self-tests
- Cholesterol Self-test
- Diabetes Self-test
- Gout Self-Test
- Iron Deficiency Self-test
- Kidney Function Test (Albumine)
- Liver and Kidney Function Combination Test
- Liver Function Test (ALT & AST)
- Preventis SmarTest Ferritin Home
- Preventis SmarTest Vitamin D test
- Prostate PSA Self-Test
- Thyroid Function Self-test
- Vitamine D Self-test
- Vivoo – Hydration Test (30 pieces)
- Vivoo – Ketone Test (30 pieces)
- Vivoo – Protein test (30 pieces)
- Vivoo – Sodium Test 30 (pieces)
- Vivoo Urine Test (9-in-1 parameters)
- Vivoo Urine Test (9-in-1 parameters) (4 pieces)
- Vivoo Urine Test (9-in-1 parameters) (12 pieces)
- Vivoo – Vitamin C Test (30 pieces)
- Drug Self-Tests
- Fertility self-tests
- Gut health self-tests
- Infectious disease self-tests
- STD self-tests
What are four symptoms of an underactive thyroid gland?

The thyroid gland is a small but important organ in your neck that plays a major role in your metabolism and energy balance. When the thyroid gland works too slowly, also known as hypothyroidism, it can cause various symptoms. Below, we discuss four common symptoms of a sluggish thyroid, so you can recognise them early and take action.
1. Fatigue
One of the most common symptoms of a sluggish thyroid is persistent fatigue. Despite adequate sleep, you may feel lethargic and exhausted. This is because a lack of thyroid hormones lowers energy levels in your body.
2. Weight gain
Many people with hypothyroidism experience unexplained weight gain. A slowed thyroid reduces your metabolism, causing your body to burn fewer calories and store fat more easily. Even with a normal diet and regular exercise, you may find that you gain weight.
3. Cold chills and sensitive skin
An underactive thyroid can affect your body temperature, making you more likely to experience chills, even in warm environments. In addition, your skin may become dry and flaky, as thyroid hormones also play a role in hydrating your skin.
4. Irregular menstruation
In women, an underactive thyroid gland can lead to changes in the menstrual cycle. This can range from heavier periods to irregularities in the cycle. The hormone deficiency affects the reproductive system and can also affect fertility.
How do you recognise hypothyroidism?
Besides these four symptoms, you may also suffer from other symptoms such as difficulty concentrating, a swollen face or hair loss. Because symptoms often occur gradually, they are not always noticed right away.
It is therefore important to test your thyroid function when in doubt. This can be done easily and reliably with The Tester’s thyroid self-test.
The solution: check your thyroid function at home
With The Tester’s thyroid self-test, you can easily measure the levels of thyroid-stimulating hormone (TSH) in your blood. The test is CE-certified, has 100% sensitivity and offers results within 10-15 minutes. This allows you to quickly get clarity on the functioning of your thyroid and contact your doctor in good time if necessary.
Want to know more? Check out our thyroid self-test here.
Recognise the signs of sluggish thyroid and take control of your health. Don’t wait any longer and order today!