<s>[INST] I am woman, 42 years and sometimes loose consciousness a while. As long as I remember it happened this year only. Once happen in front of a class. My students (I am a teacher) told it happen around a minute. I feel like black out a few seconds only. My friend suggest may be I got anemia. I take medication for it, but just yesterday it happened again. May you suggest something? [/INST] HIThanks for your post .     Black outs with loss of conscious has to be taken seriously . It indicates that there is some problem which needs to be evaluated .     Some common causes are problems in heart , brain , reduced blood supply to brain . You need to get certain tests to know what is the cause of your problems .     I advise you to get EKG , Carotid and vertebral artery Doppler, and revert back with reports . Don't neglect and delay getting tested. Any further clarifications feel free to ask . Happy to answer. Regards. </s>