The Blue one
Arteries, veins, & capillaries are the three main veins while drawing blood in arm
You definitely could have painful swollen veins in your arm after having your blood drawn many times. This happens frequently.
The three main veins in the arm are:brachial veincephalic veinbasilic vein
The radial and brachial.The basilic vein and the cephalic vein are the most important superficial veins of the arm.
basilic and sephalic
Veins appear under the surface of the skin. They're the blue one. To make them more visible you can restrict the blood flow by squeezing your arm or around the vein you want to see.
Sore spots on my arm following my blood veins.
Because not everyone is born with identical muscle and vein grouping, it's really just genetics, be happy with the veins that do show:)
Veins can be round also. However arteries have a higher pressure than veins. One reason that a tech uses a band around the arm to take blood from a vein is to make it more prominent or "round".
You should see a GP. If the GP can't figure it out, he/she will refer you to a specialist.
If you hold your arm out in front of you, palm up, the antecubital space is the area on the opposite side of your elbow. It's the area where one would usually have blood drawn as there are many accessible veins running through it.