My head's in a daze all day. What's going on?

The diseases that cause the head to be groggy all day long can be the following: First, diseases affecting metabolism, such as malnutrition, hypoglycemia and hyperlipidemia, etc., because the brain's demand for energy is very high, and brain cells can only use glucose for energy supply, if the human body shows malnutrition or hypoglycemia and other diseases, it will affect the energy supply of the brain, thus causing brain cells to lack the necessary material sources, which will cause brain nerves to be unable to play a normal regulatory and transmission role. The brain is a high-level organ of the human body, its blood circulation is relatively large, if the body qi and blood deficiency will cause cerebral ischemia, hypoxia, will also show the phenomenon of head drowsiness.