Is it normal to have a large sideways vein?

There are many options, small veins can be treated with lasers or chemicals and larger ones with lasers or surgery.  Please see an expert.  Best, Dr. Emer.

Thank you for your question.The veins in the back of the thigh are extensions of the small saphenous system, the so called vein of Giacommini. It is very easily treated in expert hands.Seek an ABVLM Certified vein specialist.Best Dr Karamanoukian

Blue veins are usually called reticular veins and can occur anywhere on the leg.  Some are a result of aging, trauma, weight or genetics.  Some are a result of malfunctioning valves (reflux) in the saphenous system of veins.  See a vein specialist for a full venous evaluation.