5 Reasons for Persistent Fatigue to Pay Attention To

Fatigue Symptoms You Should Know

Fatigue can affect people differently. Possible experiences are listed below:

• Reduced energy or stamina
• Difficulty concentrating
• Feeling physically or mentally drained
• Reduced ability to complete usual activities
• Sleep that does not leave you feeling refreshed
• Reduced motivation or interest
• General weakness or heaviness

These symptoms are not specific to one medical condition. For example, difficulty concentrating can occur with poor sleep, stress, depression, medication effects, anaemia, or other conditions.

Effect of Post-Exertional Malaise

Post-exertional malaise (PEM) is different from ordinary tiredness after exercise. PEM refers to a worsening of symptoms after physical, mental, or emotional activity that is disproportionate to the level of exertion. It is particularly associated with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) [2]. Not everyone with fatigue experiences PEM, so it should not be treated as a general red flag for all causes of fatigue.

5 Common Reasons for Persistent Fatigue

Exhaustion may seem casual, but it is usually a messenger. Identifying the causes of chronic fatigue requires looking beneath the surface.

Here are the most frequent triggers our experts diagnose:

1. Nutritional Deficiencies and Anaemia

Iron deficiency and iron-deficiency anaemia can contribute to fatigue, weakness, reduced exercise tolerance, and shortness of breath. Other nutritional deficiencies, including vitamin B12 deficiency, may also contribute to tiredness and, in some cases, neurological symptoms. Consider testing based on symptoms, diet, medical history, examination, and clinical risk factors.

For example, your doctor may consider a complete blood count (CBC) and iron studies when anaemia or iron deficiency is suspected. Vitamin B12 testing may be appropriate in people with relevant symptoms or risk factors. Vitamin D levels are not a universal explanation for persistent fatigue, so consider testing or supplementation based on your individual circumstances.

2. Thyroid Disorders

The thyroid gland helps regulate metabolism and many body functions.

An underactive thyroid (hypothyroidism) can cause the following symptoms:

• Fatigue
• Feeling unusually cold
• Constipation
• Dry skin
• Weight changes
• Reduced concentration

An overactive thyroid (hyperthyroidism) can cause a different pattern, which may include the following:

• Anxiety or irritability
• Heat intolerance
• Palpitations
• Tremor
• Sleep difficulties
• Weight loss

These symptoms overlap with many other conditions, so they cannot diagnose a thyroid disorder on their own. When a clinician suspects thyroid disease, they may order thyroid-function testing, usually starting with TSH and adding other tests as needed.

3. Sleep Disorders

Poor-quality sleep can leave you fatigued even when you spend enough time in bed. One possible cause is obstructive sleep apnoea, in which the upper airway repeatedly becomes blocked during sleep.

Here are the possible features:

• Loud or frequent snoring
• Witnessed pauses in breathing
• Gasping or choking during sleep
• Morning headaches
• Excessive daytime sleepiness
• Difficulty concentrating

However, snoring alone does not establish a diagnosis of sleep apnoea. When sleep apnoea is suspected, a healthcare professional may assess symptoms and risk factors and, when appropriate, recommend a sleep study or other diagnostic evaluation.

Other sleep problems, irregular schedules, insufficient sleep, medications, alcohol, and mental health conditions can also contribute to daytime fatigue.

4. Diabetes and Other Metabolic Conditions

Changes in blood glucose can cause tiredness, particularly when diabetes is undiagnosed or poorly controlled.

Other symptoms of diabetes may include the following:

• Increased thirst
• Frequent urination
• Unexplained weight changes
• Blurred vision
• Increased hunger
• Recurrent infections

However, fatigue alone does not indicate diabetes. Depending on the person’s symptoms and risk factors, a healthcare professional may consider tests such as fasting plasma glucose or HbA1c. These tests assess blood glucose status; they are not automatically required for everyone with fatigue.

5. Stress, Mental Health and Other Factors

Long-lasting stress can affect sleep, concentration, mood, appetite, and energy levels. Anxiety and depression can also present with significant physical fatigue.

This does not mean that stress causes “adrenal exhaustion.” “Adrenal fatigue” is not a recognised medical diagnosis, and you should not automatically attribute fatigue to depleted adrenal reserves.

Other below-mentioned factors can also contribute to fatigue:

• Poor sleep or irregular sleep schedules
• Certain medications
• Chronic pain
• Infections
• Heart or lung conditions
• Kidney or liver disease
• Other chronic medical conditions

A person’s symptoms, medical history, medications, lifestyle, and examination findings help determine which possibilities to investigate.

When Could Persistent Fatigue Need Medical Evaluation?

Consider speaking with a doctor when you experience the following patterns with fatigue:

• Constantly or repeatedly returns without an obvious explanation
• Interferes with work, education, exercise, or daily activities
• Is accompanied by unexplained weight loss
• Occurs with persistent fever or night sweats
• Is associated with shortness of breath or chest discomfort
• Occurs with significant weakness
• Is accompanied by neurological symptoms
• Is associated with significant mood changes or loss of interest
• Develops suddenly or becomes progressively worse

Urgent medical attention may be appropriate for severe or sudden symptoms such as chest pain, severe breathing difficulty, fainting, new neurological deficits, or other signs of an acute medical problem. No universal two-week rule determines when fatigue becomes a medical condition. The appropriate timing for evaluation depends on severity, duration, associated symptoms, and individual risk factors.

What Tests Might Be Considered?

No single blood test panel explains every case of persistent fatigue. Depending on the clinical history, a healthcare professional may consider the following investigations: