Difficulty expectorating sputum according to Chinese Medicine

The two Chinese Medicinal herbs most likely to help treat difficulty expectorating sputum

Why might Alum (Ming Fan) help with difficulty expectorating sputum?

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.

Read more about Alum here

Why might Borax (Peng Sha) help with difficulty expectorating sputum?

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.

Read more about Borax here