What causes fatigue, lack of energy, and easy tiredness?
Dec 12, 2025
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
Fatigue, lack of energy, and easy tiredness may be caused by insufficient sleep, excessive fatigue, iron deficiency anemia, hypothyroidism, chronic fatigue syndrome, etc. These symptoms can be improved through adequate sleep, moderate rest, and medical treatment. If symptoms persist for more than two weeks or are accompanied by other discomforts, prompt medical attention is necessary.
Weakness, lack of energy, and easy fatigue may be caused by insufficient sleep, excessive fatigue, iron-deficiency anemia, hypothyroidism, chronic fatigue syndrome, etc. These symptoms can be improved through adequate sleep, moderate rest, and medical treatment. If symptoms persist for more than two weeks or are accompanied by other discomforts, prompt medical attention is necessary.
1. Insufficient Sleep: Long-term late nights and poor sleep quality prevent the body from fully recovering, leading to low energy levels. It is recommended to maintain a regular sleep schedule, ensure 7–8 hours of sleep each night, and avoid using electronic devices before bedtime.
2. Overexertion: Prolonged overwork or excessive physical and mental exertion without timely recovery depletes energy. It is advisable to manage tasks reasonably, avoid overexertion, take timely rest when tired, and relax both mind and body appropriately.
3. Iron-Deficiency Anemia: Inadequate iron intake or excessive iron loss reduces hemoglobin production, causing oxygen deficiency that leads to fatigue, often accompanied by pale complexion and dizziness. It is recommended to take medications such as ferrous sulfate tablets, ferrous succinate oral solution, or ferrous fumarate granules under medical guidance to improve symptoms.
4. Hypothyroidism: Insufficient thyroid hormone secretion slows metabolism and reduces energy production, resulting in fatigue, drowsiness, cold intolerance, and weight gain. Patients may follow medical advice to use medications like levothyroxine sodium tablets, thyroid tablets, or liothyronine sodium tablets to relieve symptoms.
5. Chronic Fatigue Syndrome: Persistent stress and immune dysfunction lead to prolonged fatigue that does not improve with rest, often accompanied by muscle pain and reduced concentration. It is recommended to use medications such as oryzanol tablets, vitamin B1 tablets, or sertraline tablets under medical supervision to alleviate symptoms.
Maintain a regular routine and ensure sufficient sleep; eat a balanced diet rich in protein, vitamins, and iron; engage in moderate exercise such as walking or yoga; and learn to manage emotions and relieve stress to support recovery of energy.
