Fatigue is a feeling of constant tiredness, lack of energy, or exhaustion that doesn’t go away with rest. It can be physical, mental, or both, and often signals an underlying issue.

Common Causes of Fatigue

1. Lack of Sleep
Poor sleep quality or not getting enough sleep is one of the most common causes. Sleep disorders like insomnia or sleep apnea can also contribute.

2. Poor Diet
A diet low in nutrients or high in sugar and processed foods can lead to low energy. Deficiencies in iron, vitamin B12, or vitamin D are common culprits.

3. Dehydration
Not drinking enough water can cause tiredness, headaches, and difficulty concentrating.

4. Sedentary Lifestyle
Lack of physical activity can make you feel more tired. Regular exercise actually boosts energy levels.

5. Stress and Anxiety
Mental stress, emotional burnout, and anxiety can drain your energy over time.

6. Depression
Fatigue is a key symptom of depression. It can be persistent and unrelated to physical activity.

7. Medical Conditions
Fatigue can be a symptom of many health problems, including:

• Anemia
• Thyroid disorders (hypothyroidism)
• Diabetes
• Heart disease
• Chronic fatigue syndrome
• Infections (like flu, mono, or COVID-19)

8. Medications
Some medicines may cause drowsiness or fatigue as a side effect, including antihistamines, antidepressants, and blood pressure drugs.

9. Alcohol and Caffeine
Too much alcohol or excessive caffeine can interfere with sleep and contribute to fatigue.

10. Hormonal Changes
Fatigue is common during pregnancy, menopause, or due to hormonal imbalances.

When to See a Doctor

• Fatigue lasting more than two weeks
• Interferes with daily life
• Accompanied by weight loss, fever, or depression