What disease is the head sometimes not clear

1. Hypertension

due to genetic, dietary and other factors, blood vessel wall sustained pressure higher than normal, patients may appear headache, blurred vision, loss of consciousness and other symptoms, and then manifested as a clear mind.

2. Sympathetic cervical spondylosis

by cervical degeneration, cervical spinal stenosis and other factors, sympathetic nerve stimulation, patients may appear dizziness, memory loss, concentration and other symptoms.

3. Anemia

is generally caused by insufficient red blood cells, excessive destruction of red blood cells, etc., the body's blood loss, unable to normal oxygen supply to tissues and organs, patients may appear after cerebral hypoxia.