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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One of the most frequently corroborated symptoms of Natrum Carbonicum is the modality -aggravated by mental exertion. The patient is unable to think or perform any mental labor without headache (Argentum Nitricum Argentum, nit., Sabadilla Sabadilla) vertigo or a sense of stupefaction. This symptom alone makes it an invaluable remedy, as we often come across that kind of patient. At least I have, and have frequently gained great credit by relieving them. I generally use the 30th potency here. Again this kind of headache is apt to be worse on exposure to the sun's rays or under gaslight. Persons suffering from over-heating from the sun may find relief from Natrum carb., Glonoin Glonoine, Lachesis Lachesis or Lyssin (Hydrophobinum) Lyssin. Like the other Natrums, the carbonate is greatly depressed in spirits, wholly occupied with sad thoughts. It is one of our best remedies for chronic catarrh of the nose, which extends to the posterior nares and throat. There is violent hawking and splitting of thick mucus that constantly collects again, (Corallium). Although never produced in the proving, clinical use has proved it a great remedy for "bearing down" pains. Here the concomitant symptoms of mind, sadness, over-sensitiveness to noise, especially music, etc., will confirm its choice. Weakness of the ankles from childhood finds a good remedy in Natrum carb. I cured a very bad case in a young man who was very fleshy and walked on the inside of his ankles, feet bending outward, from such weakness, his ankles refusing to support him, especially when a little over-fatigued. Those are the only uses of Natrum Carb. that I know from personal experience or observation.