A member asked:

How do veins collapse in the neck?

A doctor has provided 1 answer
Dr. John Landi answered

Specializes in Phlebology

Pressure changes: Neck veins distend when we lie with our head lower than our heart or when we strain. With straining, the pressure within the chest increases and the blood flow through the neck veins decrease resulting in them enlarging.When straining is stopped, the pressure in the chest decreases and flow continues through the neck veins so they become less engorged.

Answered 12/10/2013

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Related Questions

A member asked:

On my left side on neck the vein pops out, why?

A doctor has provided 1 answer