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Materia Medica Viva Volume 3 – page 552

Margaret Tyler in her book Homeopathic drug pictures mentions some representative cases of arnica:
(1) She was taken ill one night with stitching pains in the chest that made breathing a proposition. Her husband tried to help her with various remedies probably Aconite, certainly Bryonia, but in vain. Then in a "Domestic Homeopathy" he discovered "batrd pleurisy" with its remedy arnica; and he gave her a feww globules. They were scarcely swallowed when, with a long sigh, and "that is the first breath I have been able to draw tonight!" she was fast asleep in a moment.
(2) He was a doctor who wrote that for more than a month he had had distressing difficulty in breathing, since running eighty yards. He would wake at night with "oppression in chest anxiety and fear.""Heart weakness suggests early death.".he said, yet he was "calm and not anxious.." "legs heavy; head fuzzy; could not run upstairs. Heart sounds weak, but no disease." Arnica was suggested and he wrote back: "Arnica had the desired effect! All symptoms went within forty-eight hours I am all right now."
(3) A doctor, overfatigued mentally and physically lost all interest in work. His usual self-confidence disappeared, so that he began to doubt his prescriptions and wonder whether he had prescribed too much of this, or even the wrong medicine. He was never sure whether he shut the door or turned off the lights; had to go back and see. He was naturally keenly alert, and this change of mentality worried him. Arnica 1.000 put him right in a few days, restoring perfectly his memory and self-confidence.