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I had surgery when woke up I felt like I only had 20% energy & felt extremely tired. Is this a common sensation? Why do people feel so tired after surgery?

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I think you were feeling the aftermath of the narcosis. –  Chris Jan 1 at 10:54
Of course this is common. You can account anesthesia to be responsible for this. Also if you were asked not to eat anything for some prescribed time before and after the surgery, as is usually done, the body is already in need for some energy and at the same time it is also trying to come back to the conscious state. It has to make good efforts. Surgery is a type of stress condition for the body! –  Shefali Jan 2 at 7:34

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