Dreaming of veins symbolizes your familial relationships and connections. It suggests that you are feeling a deep bond with your family or friends, or that certain matters related to them are leaving a mark on your mind. Sometimes, such dreams may also represent the need to reflect on your roots and family traditions. Your veins, associated with blood, symbolize your internal connections.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Veins" (page 459).
The veins of the children of Adam represent their tribal belonging or clan. The parable of one's veins is like that of a tree and its branches. One's veins in a dream represent his family members, depending which part of the body they belong to. The condition and beauty of one's veins in a dream denote their counterpart in one's family. If one sees his vein split open in a dream, it means the death of a relative. The same dream also could denote deceit, evil, an accident or a calamity. Otherwise, it could represent a divided family. Exposed veins in a dream mean difficulties. The point of pulsation in one's veins or the arteries, or the veins of the carpal tunnel in a dream represent one's livelihood,job, income, or the elderly people of his family. If a rich person sees a specific quantity of blood running through his veins in a dream, it means that he will lose an equal portion or percentage of his money. Otherwise, if a poor person sees that dream, it means that he will earn an equal amount of money. (Also see Aorta; Blood; Body'; Jugular vein)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.