Feeling tired all the time, even after getting enough sleep and making lifestyle changes, is called chronic fatigue. It can also affect your motivation, focus, and mood.
Blood tests could help you understand why you have low energy levels and arm you with the knowledge to boost them.
Anaemia
Anaemia happens when your body lacks enough red blood cells or a vital protein called haemoglobin. It's often caused by not having enough iron, vitamin B12, or folate.
Blood Test: Doctors can diagnose anaemia by checking your red blood cell count, haemoglobin levels and haematocrit. For iron deficiency, a ferritin test is more precise.
Low Thyroid Function (Hypothyroidism)
Hypothyroidism occurs when your thyroid gland doesn't make enough hormones, leading to symptoms like tiredness, weight gain, hair loss, and sensitivity to cold. An autoimmune condition called Hashimoto's thyroiditis is a common cause.
Blood Test: Thyroid function is checked by measuring thyroid-stimulating hormone (TSH), free T3, free T4 and thyroid antibodies.
Vitamin D Deficiency
Many people lack enough vitamin D. In the US, it is reported that up to 40% of people have low levels of vitamin D. It's important for strong bones and low levels can cause fatigue and mood disorders. This is particularly relevant in the UK where during the winter months we see very low intensity sunshine levels.
Blood Test: A vitamin D test can show if you have enough vitamin D.
Poor Liver Function
The liver helps with digestion, detoxification, and storing nutrients. If your liver isn't working well, it can cause tiredness. Non-alcoholic fatty liver disease (NAFLD) is a common liver issue.
Blood Tests: Liver function tests, such as AST, ALT, ALP, and bilirubin, can assess your liver health.
Low Testosterone Levels
Testosterone is important for energy, and both men and women need it. As you get older, your testosterone levels naturally drop, but they can also be influenced by low levels of zinc, magnesium, or vitamin D.
Blood Tests: Doctors usually start with a test for total testosterone. If symptoms persist, they may check free testosterone to get a better picture.
If you're always tired, talk to a doctor who can suggest the right blood tests based on your symptoms and medical history. Finding the causes of your fatigue is the first step in managing it effectively.
