Drinking black tea can help gastrointestinal digestion, remove greasy, stimulate appetite, promote health, increase appetite, diuresis and eliminate edema. Black tea can enhance heart function.

To this extent, black tea can promote blood circulation and improve the supply to the brain. But this is auxiliary at best.

You'd better ask his parents about the doctor's judgment and advice on his symptoms. And then deal with it.

Generally, this symptom is due to insufficient cardiopulmonary function, which leads to insufficient blood supply to the brain, and hypoxia is more common. A good way is to let him often go to places with good outdoor air quality and do aerobic exercise such as walking and jogging to improve his cardiopulmonary function, which can be gradually improved. Try to go to places with poor air quality as little as possible and don't engage in high-intensity mental work for a long time.

If he is a student, the doors and windows of the classroom are basically closed when it is cold, and the air is poor. After a class, let him walk outside the classroom and open the doors and windows properly for air. This is also good for other students. It is easy to yawn in the classroom in winter, which is also caused by lack of oxygen indoors.