The head has been dizzy for a month, may be related to poor sleep quality, may also be due to neurasthenia, insufficient blood supply to the brain and other reasons. 1. Poor sleep quality: If long-term psychological stress, excessive emotional anxiety, easy to interfere with sleep, resulting in poor sleep quality, resulting in insufficient sleep, in the long run, it may cause the head has been dizzy symptoms. 2. Neurasthenia: the disease can lead to the patient’s brain easily fatigue, and the spirit is easily excited, often making the patient combined with long-term sleep disorders. This may cause dizziness lasting for a month, may also be accompanied by memory loss, concentration and other performance. 3. Insufficient cerebral blood supply: usually due to the existence of cerebral arteriosclerosis, resulting in blood circulation in brain tissues, resulting in insufficient blood supply and oxygen supply to the brain, which may cause dizziness all the time, and may also be accompanied by headache, drowsiness and other symptoms. Dizziness has lasted for a month, can be caused by a variety of reasons, should seek medical attention as soon as possible, after a clear diagnosis of the cause, the doctor guides the treatment.