Thin blood vessels in the arm do not require treatment. The thickness of the blood vessels in the arm is related to congenital factors, i.e., the individual’s physical condition, and acquired factors, i.e., the individual’s physical activity, and usually this thickness is related to the body’s ability to adapt. If prolonged physical labor, or physical exercise leads to arterial dilatation, increased blood supply, and a corresponding increase in venous return, the blood vessels will thicken, while on the contrary they will thin. Thinning of the blood vessels, although it does not have any pathological consequences, because of the thin blood vessels often suggests that the physical labor and physical exercise is low, but also suggests that the body may be in a state of sub-health. If the physical condition permits, more physical exercise or physical labor should be carried out in order to restore the body’s state and improve the immune system, and the blood vessels will also thicken accordingly.