The transverse sigmoid sinus is more slender than the right side, and if there are no uncomfortable symptoms, no special treatment is usually needed. If there are uncomfortable symptoms, attention should be paid to observation. The transverse and sigmoid sinuses are large intracranial veins that are important return vessels. When these vessels become thin, they may interfere with the return of blood to the body. The thinness of the transverse and sigmoid sinuses is usually caused by congenital dysplasia and may also be caused by stenosis. In addition abnormal functioning of the intracranial veins may also contribute to the development of this condition. Normally, the transverse sinus on one side is physiologically elongated, and if there are no uncomfortable symptoms, this means that it has compensated for itself and does not require special treatment. As long as there are no uncomfortable symptoms, it can be observed for a long time without too much worry. Therefore, it is recommended that patients go to the hospital for cerebral blood flow examination to identify the specific cause, and then choose the appropriate treatment plan according to the examination results and their own situation.