This is also a good opportunity to discuss important travel health issues including safe food and water, accidents, sun exposure and insect bites. Many of the problems experienced by travellers cannot be prevented by vaccinations and other preventive measures need to be taken.
Age and genetics. As you get older, the veins in your hands may become more visible. Additionally, some peopleâs veins are naturally more visible. This could be due to skin pigmentation, body fat distribution, or a variety of other genetic factors. In most cases visible veins in hands are not a sign of a medical condition, or of any other problems.
Why are valves more important in arm veins and leg veins than in neck veins? Valves are more important in arm veins and leg veins than in neck veins because, when you are standing, gravity causes pooling of blood in the veins of the free limbs but aids the flow of blood in neck veins back toward the heart. A person who has liver failure cannot synthesize the normal amount of plasma proteins.