The pain of a migraine is caused by: A. vision loss B. Blood vessels narrowing, resulting in less blood flow to the brain C. Blood vessels expanding, which allows more blood flow to the brain D. Muscle Tension in shoulders and neck

Answer is option "A"

Explanation:

Loss of vision can happen out of nowhere or grow step by step after some time. Vision misfortune might be finished (including the two eyes) or incomplete, including just one eye or even certain pieces of the visual field. Vision misfortune is unique in relation to a visual impairment that was available during childbirth, and this article is worried about reasons for vision misfortune in a person who recently had a typical visionHence, the right answer is option A "vision loss"

Empty or clean by the force of suction ( a body cavity)