Numbness and lack of energy may be due to hyperventilation syndrome, electrolyte disorders, hypoglycemia, rheumatic diseases and other reasons. 1. Hyperventilation syndrome: patients who are too nervous, fatigue, may also cause increased respiratory rate, resulting in too much oxygen and can not be exchanged into the blood, the body will appear in the blood acid-base imbalance, resulting in dizziness, numbness of the limbs, weakness and other related symptoms. 2. Electrolyte disorders: If the patient eats less, or suffers from gastrointestinal and kidney diseases, it may lead to the loss of a large number of sodium ions, calcium ions, potassium ions and other electrolytes in the blood and tissues, which will be accompanied by symptoms such as nausea, vomiting and weakness of limbs when the electrolyte level in the body exceeds the normal range. 3. Hypoglycemia: If the patient suffers from hypoglycemia, the glucose content in the blood will be relatively low, which can’t replenish the energy needed for each organ, and the brain may suffer from insufficient supply of oxygen and blood, which will further lead to the symptoms of numbness and lack of energy. 4. Rheumatic diseases: patients who suffer from rheumatic diseases, usually involves the body’s joints, tendons, muscles and other tissues, when the relevant tissues are damaged, there may be varying degrees of numbness, acidity, so numbness and lack of energy may be caused by rheumatic diseases. If you are experiencing numbness and lack of energy, you should go to the hospital in time to avoid delaying your condition.