Thread Veins and Spider Veins can be found on the legs and face, (usually on the cheeks and around or on the nose), and can become more common after mid-life when the skin becomes thinner and starts losing elasticity. However, people from young children right through to the elderly sometimes have them. There are many factors involved in developing Thread Veins including ageing, sun bathing, pregnancy, smoking, harsh weathers, energetic sports, weight problems, hormones and genetics. Rosacea is also a common reason for these veins.