The vast majority of venous thinning is due to a decrease in physical work or physical exercise, and for venous thickness, it is mainly the result of a combination of congenital and acquired factors. The congenital factor is mainly a matter of personal constitution, but the influence of acquired factors on the thickness of blood vessels is also very important. In the case of people who do physical work or physical exercise frequently, the blood supply to the arteries increases because the muscles need more oxygen and nutrients, so the arteries will expand and the corresponding reflux veins will also expand, in which case the blood vessels will become thicker, and vice versa. Although the thinning of the veins is compatible with the state of the body and does not have any pathological effects, it often means that it is the result of reduced physical work or physical exercise performed, which may affect the normal state of health of the person. In the absence of any specific medical condition, it is still recommended to actively engage in physical work or physical exercise to improve the body’s fitness.