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Experiencing extreme fatigue? Here are common causes – and markers you can test

Experiencing extreme fatigue? Here are common causes – and markers you can test

Fatigue beyond the ordinary that persists despite sufficient sleep and rest may have underlying causes. These could, for example, include a lack of iron or vitamin D. Here, you can learn more about possible reasons for fatigue and how to obtain information about your levels.

6 Health factors extreme fatigue can be linked to

Darkness and a busy schedule at home, work, and school are some examples of external factors that can make us tired. If you experience abnormal and constant fatigue, feeling lethargic without a clear cause, it may be valuable to examine your health to identify potential underlying causes for your symptoms.

Low vitamin d levels

During the winter months, especially in northern regions like Sweden, sunlight exposure may be limited, affecting vitamin D levels. Deficiency in vitamin D, occurring at low levels, can be linked to fatigue and decreased well-being. You can test your Vitamin D levels here.

Imbalanced iron status

Iron deficiency or anemia can lead to fatigue and reduced energy. A blood test to measure your hemoglobin, ferritin, iron and other iron-related parameters can provide information about your iron status. Learn more about the iron deficiency test here.

Imbalances in thyroid hormones

Hypothyroidism (underactive thyroid) is a common cause of fatigue. Testing levels of thyroid hormones such as TSH (thyroid-stimulating hormone), T3 and T4 can provide insight into thyroid function. The Thyroid Test tests all three markers.

Vitamins and blood sugar

Low levels of B12 vitamin and folate can be associated with fatigue and energy deficiency. These markers are included in the Vitamin and Mineral Check.

A marker measuring average blood sugar levels over time is HbA1c, which can be a relevant blood test to exclude diabetes or pre-diabetes, affecting energy levels.

Low testosterone levels

Low testosterone levels in men can lead to fatigue and reduced energy. A blood test can provide information about testosterone levels. Learn more about the Testosterone Test through a blood test here.

Relaterade tester

Testosterone test


  • Measuring your level of testosterone.
  • Analysis to identify testosterone deficiency.
  • Get increased insight into your testosterone level.

195 kr179 kr

Thyroid test
Thyroid hormone test

Thyroid test

  • Thyroid test that measures three different thyroid hormones.
  • Analysis of the thyroid hormones T3, T4 and TSH.
  • Gives you insight into a possible imbalance of your thyroid hormones.
  • Identifies whether you have an underactive or overactive thyroid.

349 kr

Vitamin D
Vitamin D Test

Vitamin D

  • Measures your level of vitamin D.
  • Identifying vitamin D deficiency
  • Get answers to whether any symptoms may be due to vitamin D deficiency.

295 kr229 kr

Vitamin B12
  • Measures your levels of vitamin B12.
  • Indication of vitamin B12 deficiency.
  • Low levels can lead to anemia.

159 kr

Diabetes & blood sugar test


  • Blood sugar test, analysis of your blood sugar level.
  • Demonstrates a possible risk of getting diabetes mellitus type-2.
  • Analyzed to screen and diagnose diabetes mellitus type-2.
  • Shows the level of your long-term sugar.

79 kr

Iron deficiency
Iron deficiency test

Iron deficiency

  • Measures your iron value and your iron depot.
  • Analysis of iron and ferritin.
  • Analysis of your blood status is included.
  • The test identifies any iron deficiency.

349 kr

Anemia test


  • Measuring your folate levels.
  • Indicates possible folate deficiency.
  • Indication for anemia.

85 kr