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Causes of fainting. Fainting (syncope) is caused by a temporary reduction in blood flow to the brain. Blood flow to the brain can be interrupted for a number of reasons. The different causes of fainting are explained below. Fainting is most commonly caused by a temporary malfunction in the autonomic nervous system.
Causes of Numbness and Tingling. Many things can cause numbness and tingling, including some medications. Everyday reasons that are no cause for concern include: 1  lack of movement, for example when you sit or stand in one position for a long time. 2  sitting with your legs crossed. 3  falling asleep on your arm.