Below are the main rubriks (i.e strongest indications or symptoms) of Oxalicum Acidum in traditional homeopathic usage, not approved by the FDA.
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Heart; Palpitation and dyspnoea in organic heart disease; WORSE, when thinking of it
Precordial pains which dart to the left shoulder
Heart symptoms alternate with aphonia, Angina pectoris; sharp, lancinating pain in left lung coming on suddenly, depriving of breath
Breathing spasmodic, with constriction of larynx and chest
left lung painful
Paralysis of the tensors of vocal cord
Dyspnoea; short, jerking inspirations
Sharp pain through lower region of left lung, extending down to epigastrium.≡ more ...