Fatigue can be defined as a state of physical or mental exhaustion that is caused by prolonged or intense activity. It is a feeling of weariness, tiredness, and lack of energy that can significantly impact a person's ability to function effectively. One of the primary causes of fatigue is a lack of sleep or poor sleep quality. Our bodies need adequate rest to repair and recharge, and not getting enough sleep can result in physical and mental exhaustion. Additionally, certain medical conditions, such as anemia, hypothyroidism, or depression, can also cause fatigue. Lifestyle factors can also contribute to fatigue. Poor diet, lack of exercise, and excessive alcohol or caffeine consumption can all affect our energy levels. Chronic stress and overworking can also lead to burnout and chronic fatigue. Visit - Definition of Fatigue