Below are the main rubriks (i.e strongest indications or symptoms) of Causticum in traditional homeopathic usage, not reviewed by the FDA.
Hoarseness with pain in chest; Aphonia
Cough with raw soreness of chest
Expectoration scanty; Must be swallowed
Cough With pain in hip, especially left worse in evening; Better, drinking cold water; worse, warmth of bed
Sore streak down trachea
Mucus under sternum, which he cannot Quite reach
Pain in chest, with palpitation
Cannot lie down at night
Own voice roars in ears and distresses
Difficulty of voice of singers and public speakers (Royal).≡ more ...