Fatigue: When to Get Checked and Which Results to Watch
Learn when fatigue might be a sign of an underlying issue and which lab results to monitor.
Feeling tired is something everyone experiences, but when fatigue becomes persistent or overwhelming, it may be a sign of an underlying health issue. Understanding when to seek medical advice and which lab results to watch can help you manage your health effectively.
What is fatigue?
Fatigue is a feeling of constant tiredness or weakness and can be physical, mental, or a combination of both. It is different from simply feeling sleepy or drowsy. Fatigue can interfere with your ability to carry out daily activities and may not improve with rest or sleep.
Why does fatigue matter?
Fatigue can be a symptom of various medical conditions, ranging from mild to serious. It might indicate issues such as anemia, where your blood does not carry enough oxygen to your body's tissues, or thyroid disorders, which affect your metabolism. Chronic fatigue can also be associated with mental health conditions like depression or anxiety.
Important lab markers for fatigue
Several lab tests can help determine the cause of fatigue:
Complete Blood Count (CBC): This test measures different components of your blood, including red blood cells, white blood cells, and platelets. A low red blood cell count can indicate anemia.
Thyroid Function Tests: These tests measure levels of thyroid hormones. Both hypothyroidism (low thyroid hormone levels) and hyperthyroidism (high thyroid hormone levels) can cause fatigue.
Iron Studies: These tests measure iron levels in your blood, helping to diagnose iron deficiency anemia, a common cause of fatigue.
Blood Glucose Levels: High or low blood sugar levels can cause fatigue and may indicate diabetes.
Vitamin D Levels: Low levels of vitamin D can contribute to fatigue and are common in people with limited sun exposure.
What raises or lowers fatigue?
Several factors can influence fatigue levels:
Lifestyle Factors: Poor diet, lack of exercise, and insufficient sleep can all contribute to fatigue. Managing stress and improving sleep hygiene can help reduce fatigue.
Medical Conditions: Conditions such as sleep apnea, chronic fatigue syndrome, and fibromyalgia can cause or exacerbate fatigue.
Medications: Some medications have side effects that include fatigue. If you suspect your medication is causing fatigue, consult your doctor.
Frequently asked questions
What is the difference between fatigue and tiredness? Fatigue is a persistent feeling of tiredness or weakness that does not improve with rest, while tiredness is usually temporary and relieved by rest or sleep.
Can stress cause fatigue? Yes, stress can lead to fatigue by affecting your sleep patterns and increasing your body's demand for energy.
Is fatigue always a sign of a serious condition? Not always. Fatigue can result from lifestyle factors such as poor diet or lack of sleep. However, persistent fatigue should be evaluated by a healthcare professional to rule out underlying conditions.
When to see a doctor
If you experience persistent fatigue that interferes with your daily life, or if it is accompanied by other symptoms like unexplained weight loss, fever, or shortness of breath, it is important to consult a healthcare professional. They can help determine if further evaluation or testing is needed.
Remember, only you and your clinician can decide the best course of action for your health.