Below are the main rubriks (i.e strongest indications or symptoms) of Natrum Carbonicum in traditional homeopathic usage, not approved by the FDA.
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Stomach; Feels swollen and sensitive
Ill effects of drinking cold water when overheated
Hungry at 5 a.m
Very weak digestion, caused by slightest error of diet
Averse to milk
Depressed after eating
Old dyspeptics, always belching, have sour stomach and rheumatism
Dyspepsia relieved by soda biscuits.≡ more ...