Weakness after illness according to Chinese Medicine
The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
Crown prince ginseng might help with weakness after illness
Why might Crown Prince Ginseng (Tai Zi Shen) help with weakness after illness?
Because it is a herb specifically indicated to treat weakness after illness as can be seen on Crown Prince Ginseng's page.
Crown Prince Ginseng is a Neutral herb that tastes Bitter and Sweet. It targets the Spleen and the Lung.
Its main actions are: Tonifies the the Lung and Spleen Qi. Supplies Body Fluids.