However, Corallium not only has the rapid and exhausting ‘machine gun cough’ mentioned above, but also a kind of ‘minute gun cough’ as both Hering and Clarke call it. This is a short, dry cough that comes in single, isolated bouts, all day long at regular intervals. This kind of cough may occasionally ‘densify’ and inten- sify into a violent, spasmodic coughing paroxysm.
Corallium’s action on the mucous membranes results in a great sensitivity, especially to every change in the temperature of the inspired air. ‘Any change of air sets patient coughing’ and particularly any change from warm to cold, e.g. when leaving a warm room. This sensitivity to air makes one think of Cistus, especially since there are strange sensations of coldness in both the remedies. But the Corallium sensation is rather a feeling of a cold wind or draught in the organism, whereas Cist. usually reports a simple ‘sensation of coolness’. A symptom repeatedly caused and cured by Cist. is, ‘On deep inspiration, sensation as if air passing through air passages was icy cold, with some inclination to cough and much difficult hawking up of bronchial mucus, in the morning’.
The proving also gives the symptom; ‘Great dryness of mucous membranes of nose and pharynx’. But the ‘wind feelings’ of Corallium are by no means confined to the respiratory passages. They might also be perceived in the head: ‘Sensation as though a wind passed through the skull, on rapid motion of the head or on rocking it’. The head may be felt as ‘hollow’ or ‘empty’ so that wind seems to blow right through it.
In Corallium patients, the nasopharynx is particularly sensitive. Nash finds it the most useful of all remedies in post-nasal catarrh. A proving symptom that has often been confirmed:
‘Profuse secretion of mucus dropping through posterior nares, obliging constant hawking’.