Qi Deficiency symptoms almost always include feeling tired.  Usually you’ll also experience poor digestion, usually as loose stools, as well.  More severe Qi Deficiency symptoms are uncontrolled bleeding or prolapsed organs.  

The potential causes of Qi Deficiency are poor absorption of nutrition from eating too much sugary foods (carbs) or cold-natured foods; overworking; poor recovery from illness or childbirth; or even just worrying too much.  More severe Qi Deficiency symptoms are uncontrolled bleeding or prolapsed organs. 

To strengthen your Qi, eat small meals of warm foods and try relaxation techniques.  Get more rest!  Herbs that can help include Licorice, Ginger, Black Pepper, Astragalus, and Ginseng.