Below are the main rubriks (i.e strongest indications or symptoms) of Causticum in traditional homeopathic usage, not approved by the FDA.
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Dryness in throat, posteriorly.
Mucus collects in the throat, cannot be raised by hawking; obliged to swallow it.
Hawking of mucus, with pain in pit of throat.
Rawness in throat, with sensation like heart-burn.
Rawness and tickling in the throat, with dry cough and some expectoration only after long coughing.
Must swallow continually, feels as if the throat were too narrow.
Swelling like goitre, on the throat.
Hoarseness worse morning and evening, with scraping in the throat; for several days could not speak loud.
Croup, especially when there is a raw sensation in the larynx.
The laryngeal muscles refuse their service; cannot speak a loud word. When he tries to raise his voice, it fails or becomes a squeak.≡ more ...