When a person feels tired and weak and has low spirits, it will affect daily work and life, and in the long run, physical health will also be affected. Therefore, it is necessary to find out the reasons for always having no energy and deal with them actively. First of all, the common reason for always having no energy is short sleep or poor sleep quality at night, as well as too much tension and fatigue at work or study during the day, which can cause the body and brain to not get enough rest and conditioning, resulting in drowsiness, sleepiness and lack of energy. Secondly, lack of energy may be due to poor physical health, such as being in a hypoventilated state during sleep, resulting in lack of oxygen to the brain and poor sleep quality; or due to anemia, the body’s red blood cells and hemoglobin are reduced, resulting in lack of oxygen to tissues and organs. In addition, hypothyroidism, hypoglycemia, and depression can also make people feel unrefreshed. Always having no energy and feeling physically tired, it is recommended to adjust the rhythm of life, improve the quality of sleep, exercise properly and increase the interest of life, such as going out for fun and joining hobby classes. If you can’t improve your mental state after daily adjustment, you can promptly consult a neurologist to check whether there is organic disease, and then carry out medication or psychotherapy.