###Human: I am getting blackout when I turn my head to the right. Why? ###Assistant: Hello. Do you mean blackout as the sudden loss of consciousness? May I know what is the extent of the episode? If you feel blackout when looking up or turning your head, this may be due to pinching of the arteries that are present alongside the spine, called vertebral arteries. This can sometimes happen as a result of changes in the vertebrae. Pinching of these vertebral arteries can occasionally cause blackouts as the blood flow is temporarily reduced. One condition called cervical rib, here extra rib in the neck area may compress the artery. Some time any lesion in brain clot or ischemia may cause transient ischemic attack (TIA). Better go through investigations such as CT brain, x-ray cervical spine AP or lateral view, FBS (fasting blood sugar), PPBS (postprandial blood sugar test), lipid profile and CBC (complete blood count).