A dizzy and heavy head may be related to poor sleep quality, or it may be caused by insufficient blood supply to the brain, iron deficiency anemia and other reasons. 1. Poor sleep quality: If the quality of sleep is not good recently, dreamy and easy to wake up during sleep, and in a light sleep state for a long time, resulting in the brain can not get a good rest, it may cause the head always dizzy and heavy, and may be accompanied by headache, poor mental state and other manifestations. 2. Insufficient blood supply to the brain: due to poor blood circulation in the brain tissue, resulting in insufficient blood supply and oxygen supply to the brain, which may cause dizziness and drowsiness, and may also be accompanied by headache, sleepiness and other manifestations. 3. Iron deficiency anemia: due to insufficient blood volume in the body, the number of red blood cells decreases, the blood oxygen content decreases, resulting in a chronic lack of oxygen in the brain, which may cause dizziness, heavy head, may also be accompanied by pale, lack of strength and other symptoms. Dizziness and heavy head may also be caused by other reasons, if the symptoms continue to be unrelieved, it is recommended to seek medical attention as soon as possible.