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Loss of feeling is called numness.Sudden numbness can be due to a lack of muscle strength in any group of muscles,nerve compression syndromes, circulatory disorders(poor blood circulation),high blood pressure,diabetes,multiple sclerosis,stroke,transient ischemic attack.Other causes are:abnormal levels of calcium, potassium, or sodium in your body,lack of vitamin B12,
General rule of thumb is that If you have a sudden numbness or weakness in any part of your body, and there isn't a logical explanation for it, you should seek medical care immediately.
So I advice you to evaluate at ER.
Hope this helped.