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.
Because it is a herb specifically indicated to treat difficulty expectorating sputum as can be seen on Alum's page.
Alum is a Cold herb that tastes Pungent and Sour. It targets the Spleen, the Large intestine, the Liver and the Lung.
Its main actions are: Stops itching, relieves Damp-Heat inflammation and kills parasites. Stops blood in stools and urine as well as all types of bleeding if used topically. Relieves diarrhea. Clears Heat and relieves Wind-Phlegm.
Because it is a herb specifically indicated to treat difficulty expectorating sputum as can be seen on Borax's page.
Borax is a Cool herb that tastes Salty and Sweet. It targets the Stomach and the Lung.
Its main actions are: Applied topically for Toxic-Heat. Clears Phlegm-Heat in the Lungs.
Skin itching Itchy rashes Blood in urine Convulsions Irritability Sore throat Throat pain Open sores in mouth Red eyes Swollen eyes