Below are the main rubriks (i.e strongest indications or symptoms) of Natrum Sulphuricum in traditional homeopathic usage, not approved by the FDA.
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Diarrhoea, acute or chronic worse in the morning on beginning to move (Bryonia Bry.), with much flatulence (Aloe Socotrina Aloe and Calc Carb Calc. Phosphorus Phos.), and rumbling in abdomen, especially right ileo-caecal region.
Loose cough, with great pain in the chest; worse in lower left chest (right, Chelidonium Majus Chel.).
Modalities worse in cold, wet weather; damp cellars; hydrogenoid (diarrhoea, rheumatism, asthma).
Mental effects from injuries to head.
Chronic effects of blows, falls.
Gonorrhoea; greenish-yellow, painless, thick discharge (Pulsatilla Puls.).
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Natrum sulphuricum is also one of our armamentarium for diarrhoea, both acute and chronic. Like Podophyllum Peltatum Podophyllum, Sulphur Sulphur, Nuphar and Rumex Acetosa Rumex, the diarrhea is aggravated in the morning. Sulphur Sulphur drives the patient out of bed, but Natrum Sulphur sulph., like Bryonia Bryonia, is worse only after beginning to move. Then again Natrum Sulphur sulph. has, like Aloe Socotrina Aloe, much rumbling in the bowels as of flatulence. This rumbling of flatus is often with Natrum Sulphur sulph. located in the right side of the abdomen in the ileo-caecal region.
Again the Natrum sulphuricum stool is, like China China, Argentum Nitricum Argentum nit., Calc Carb Calcarea Phosphorus phos., Agaricus Muscarius Agaricus and Aloe Socotrina Aloe, accompanied by a profuse emission of flatus. This flatulence is not always present, but is often so. In chronic diarrhoea there is almost always some trouble with the liver, evidenced by soreness in right hypochondrium, which is sensitive to touch, and hurts on walking or any jar. One very strong characteristic for Natrum Sulphuricum in this trouble is aggravation of the diarrhoea, pain, etc., in damp weather. In this it resembles Dulcamara Dulcamara and Rhododendron Rhododendron. The Dulcamara Dulcamara has the aggravation in change from warm to cold weather, weather damp or dry. This aggravation in damp weather is not confined to diarrhoea in Natrum Sulphur sulph. but is especially present in cases of chronic asthma. I have seen very great benefit in such cases of this very troublesome and obstinate disease, and as aggravation in damp weather very commonly occurs in cases of old asthma Natrum Sulphuricum is often indicated. I have not observed much benefit from Natrum Sulphuricum in runarounds, for which it is highly recommended; but have seen nice results from it in very obstinate cases of gonorrhoea, when the discharges was thick and greenish and little pain. Loose cough, with soreness and pain through the left chest, is very characteristic. This is one of the chief diagnostic points of difference between Bryonia Bryonia and Natrum sulphuricum, that while with both there is great soreness of the chest with the cough, with Bryonia Bryonia the cough is dry, while with Natrum Sulphur sulph. it is loose. The patient springs right up in bed, the cough hurts him so.
There is as much soreness as there is with Bryonia Bryonia, and when the patient coughs he springs up in bed and holds the painful side in his hand to ease the hurt. This symptom may be found in chronic affections of the respiratory organs, such as asthma, phthisis, etc., and I have several times seen remarkably prompt relief and cure follow its administration in pneumonia when this symptom was present. This pain through the lower left chest is as characteristic for Natrum Sulphur sulph., as is that of pain running through right lower chest for Kali Carb Kali carbonicum.