Dizziness and heavy-headedness may be physiological factors, but also may be the manifestation of certain diseases, such as cervical spondylosis, postural hypotension, diabetes mellitus, autonomic dysfunction and so on. 1. Physiological factors: some people stay up late for a long time, lack of sleep or mental tension, high pressure, insufficient blood supply to the brain, you will feel dizzy and heavy-headed. 2. Pathological factors (1) Vertebral artery type cervical spondylosis: mostly due to cervical vertebral osteophytes, ligament calcification and maintaining the same posture for a long period of time and other factors lead to blood vessel pressure in the neck, causing chronic insufficient cerebral blood supply, and the mind appears to be unconscious and heavy feeling. (2) Postural hypotension: When postural hypotension occurs, the patient changes from the lying position to the established position, and symptoms such as unconsciousness, heaviness and unsteadiness in standing will occur. (3) Diabetes mellitus: the patient’s blood sugar increases for a long period of time, which leads to slowing down of blood flow, increasing blood viscosity, impaired utilization of sugar, causing insufficient energy in the body, and the patient will experience unconsciousness and heaviness. (4) Autonomic dysfunction: mostly related to long-term mental stress, poor sleep or overthinking and other factors, the balance of the autonomic nervous system is abnormal, brain nerve dysfunction, which will lead to unconsciousness and heaviness. If physiological causes are ruled out, timely consultation should be made with the doctor to specify the cause of the disease and appropriate treatment should be carried out if necessary.