Patients always feel dizzy, no strength, mainly consider the following aspects of the cause: 1, this situation if the middle-aged and elderly, to consider may be due to chronic cerebral blood supply insufficiency caused by the general ischemia of the posterior circulation will lead to the patient to appear in this area of the symptom. 2, if the patient is usually low blood pressure, hypertension and unstable blood pressure control or diabetes mellitus patients, in the daily life of patients are also prone to dizziness, lightheadedness, no strength symptoms. 3, the patient is always dizzy, no strength, may also be caused by anemia, can be clarified by doing blood tests. Dizziness, dizziness, and lack of energy symptoms. 3, the patient is always dizziness, no energy, may also be caused by anemia, you can do routine blood tests to make clear, this kind of patients face, nails will be pale. 4, the patient is always dizziness, no energy, but also to consider is the heart disease, such as chronic cardiac insufficiency.