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Materia Medica Viva Volume 8 – page 1703

although he tries and tries until he is exhausted. Even if the mucus is loosened, there is an inability to throw it out, and so it has to be swallowed. The mucus tends to be acrid and taste greasy or soapy.
The cough is excited by the accumulation of mucus and/or a tickling irritation in the throat. A marked modality is that a swallow of cold water relieves.
Paroxysmal dry, hollow cough (‘as if he were coughing into a barrel’, as Kent puts it), with a sore feeling on a streak in the trachea, where it hurts on every paroxysm of cough, almost hindering inspiration.
Some modalities: irritation to cough on every expiration; from stooping; from any talking. The cough is worst in the evening and at night (particularly before midnight), sometimes also in the morning, and will wake the patient from his sleep; by day, there is often only little or no cough. Bonninghausen relates that in most cases the mucus will be loosened by night, but not by day; but that also the reverse occurs.
There are some very prominent accompanying symptoms: a loss of drops of urine every time one coughs (a real key-note of Causticum); a pain over the hip as if it would burst there; pain in the abdomen, soreness in abdominal muscles and bowel; rattling, soreness, rawness, and burning in the chest and air passages; raw retrosternal pain.
The spells of coughing will be preceded by shortness of breath.
Difficult and deep inspiration. Dyspnoea, mostly in the morning; with frequent sighing. Suffocating fits on inspiration as if someone had constricted his larynx, with sudden arrest of breathing.
Tightness of chest, with a frequent urge to take a deep breath. The oppression may be felt as if the clothes were too tight around the chest; or there is a painful compressive sensation from both sides to the sternum, with oppression of breath and weak voice; or it feels as if a load were on the chest. Oppression of chest with anxiety, after stool.
Deep breathing brings on a stitching in the sternum (which is also caused by lifting), or a feeling of tension in chest.
Sore pain, burning, stitching in chest; with the cough, but also without. Much rattling of mucus. Chest pain with fluent or stopped coryza.
Stitches at chest, from under the arm to the pit of the stomach, with anxiety. Arrest of breathing when talking or rapidly walking; must suddenly gasp for breath.