<s>[INST] My family members noticed my head shaked (left and right) when I sat still. It happened for a few months. I noticed nothing about it. My husband said if the head shaked like that I should faint or see nothing clear. What possibilities causes this? Thanks in advance for your advise. [/INST] Hello, This can occur with a wide variety of conditions. Stroke would be ONE side and not both. Parkinson's certainly often starts this way but alcohol or other vitamin deficiency can do it (and often makes someone unable to put down good internet questions) b12 disease can, but it is usually more in the feet. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.  </s>