Causes of Fatigue

Fatigue can have many causes, including lifestyle factors, physical health conditions, and emotional or psychological issues.
In many cases, more than one factor is involved.

Lifestyle-Related Causes

• Insufficient or poor-quality sleep
• High stress levels at work or home
• Irregular eating patterns or poor nutrition
• Dehydration
• Excessive caffeine or alcohol intake
• Low levels of physical activity or, conversely, overtraining

Medical Causes

Fatigue is a common feature of many medical conditions. These may include:

• Anaemia (low red blood cell count or iron deficiency)
• Thyroid disorders (underactive or overactive thyroid)
• Vitamin and mineral deficiencies (e.g., vitamin B12, folate, vitamin D)
• Diabetes or blood sugar imbalance
• Heart, lung, liver, or kidney disease
• Chronic infections or inflammatory conditions
• Sleep disorders such as sleep apnoea
• Chronic fatigue syndrome (CFS/ME)

Emotional and Psychological Causes

• Depression or low mood
• Anxiety or persistent worry
• Work-related stress or burnout
• Significant life changes or ongoing emotional strain

Patterns of Fatigue

The way fatigue presents can provide clues about the underlying cause:

Short-Term (Acute) Fatigue

• Often related to a recent illness, late nights, travel, or stress
• Usually improves with rest, recovery, and better sleep
• May be accompanied by mild headache, muscle aches, or reduced focus

Persistent or Long-Lasting Fatigue

• Lasts for several weeks or months
• Does not fully improve with sleep or rest
• May be linked to chronic conditions such as anaemia, thyroid disorders, diabetes, or sleep apnoea
• Can be associated with low mood, anxiety, or other mental health concerns

Severe Fatigue

• May make it difficult to get out of bed or manage daily tasks
• Can be associated with breathlessness, chest discomfort, dizziness, or unintentional weight changes
• Requires prompt medical assessment to exclude serious illness

Treatment for Fatigue

Treatment for fatigue depends on the underlying cause. After assessing your symptoms and arranging appropriate tests, your doctor may recommend:

Lifestyle and Sleep Management

• Establishing a regular sleep schedule and improving sleep hygiene
• Gradually increasing physical activity as tolerated
• Optimising diet, hydration, and limiting alcohol or caffeine
• Stress reduction strategies such as relaxation techniques or mindfulness

Medical and Specialist Treatments

• Iron, vitamin B12, folate, or vitamin D supplements when needed
• Medication to treat thyroid disorders or other hormonal imbalances
• Management of diabetes, heart disease, or other chronic conditions
• Referral to a sleep clinic, cardiologist, or other specialist if required

Emotional and Psychological Support

• Counselling or talking therapies
• Cognitive behavioural therapy (CBT) for anxiety, stress, or low mood
• Support in managing work–life balance and lifestyle changes

Important:

If your fatigue is severe, persistent, getting worse, or associated with symptoms such as chest pain, severe shortness of breath,
confusion, or sudden weight loss, you should seek medical advice promptly. Early assessment helps identify treatable causes and
reduces the risk of complications.