Below are the main rubriks (i.e strongest indications or symptoms) of Zincum Metallicum in traditional homeopathic usage, not approved by the FDA.
Have you ever used Zincum Metallicum? Yes No
Inability to develop or hold out the rash in eruptive diseases, can't expectorate or menstruate, is better if can.
Cannot take stimulants, as they aggravate in general.
Fidgety feet, must move them constantly.
Twitching of single muscles all over the body.
Violent trembling all over, so as to shake the bed; lost nerve control.
Weakness and weariness in nape of the neck; worse holding head long in one position; backache worse sitting.
Modalities worse from wine; better by restoration or development of eruptions, during menses, restored expectoration, seminal emission, discharges generally.
Defective vitality, brain and nerve power wanting; to comprehend, to memorize.
Child cries out during sleep; rolls the head from side to side; face alternately pale and red.
Zincum Metallicum metal seems to act principally upon the nervous system. I think it is Burt who says "What Iron is to the blood, Zinc is to the nerves." If we examine the provings and clinical records of Zinc, we find that it seems to have the power to arouse or strengthen the nervous system in its inability to supply force to carry on functions necessary to health or the elimination of disease products from the system. This is speculation. What are the facts? 1st. If scarlatina or other eruptive diseases do not properly develop the eruption, on account of too great weakness of the patient, as evidenced by general depression of pulse, temperature, etc. Zinc is very useful.
Other remedies have such or similar trouble, Cuprum Metallicum Cuprum, for instance; but in Cuprum Metallicum Cuprum the eruption has been suppressed by some outward cause. Zinc, it has never come to the surface, or it has been out, and has receded from lack of vitality or strength to hold it there. Sulphur Sulphur may be the remedy, but the cause is then more often apt to be traceable to psora.
Zincum Metallicum weakness shows in other ways, as, for instance, in asthma. The patient can't expectorate, but as soon as he can he is relieved; or again she cannot menstruate, and is relieved of her suffering while menstruating. (Lachesis Lachesis).
There is another peculiarity connected with this characteristic. The nervous weakness of the Zincum patient is that he can take no wine or stimulants. You would think that a little wine would at least temporarily relieve; on the contrary, it aggravates all the sufferings, even though taken in small quantities. Of course other remedies have this aggravation from wines or stimulants, like Glonoin Glonoine, Ledum Palustre Ledum, Fluoric acid, Antimonium Crudum Antimonium crudum, etc., but I think Zinc stands first.
The nervous debility of Zinc shows in other ways also. There is sometimes aching and weariness in the nape of the neck, as it had been held in one position too long, worse by writing or other long continued labor. The backaches are worse while sitting and better when moving about. This would call to mind Rhus Tox Rhus toxicodendron, but with Zincum you would not get the general aching relieved by continued motion, as in the case with Rhus Tox Rhus. Pulsatilla Pulsatilla has it also, but generally in connection with menstrual irregularities. The remedy most resembling Zinc in this particular is Cobalt. Both these remedies have this symptom in consequence of sexual excesses or weaknesses, but in Zinc an emission temporarily relieves the pain and in Cobalt it does not. The most characteristic of all the symptoms of Zinc in connection with its general nervous weakness, is "An incessant, violent fidgety feeling in the feet or lower limbs.." This is present in many, if not almost all, of the affections for which Zinc is par excellence the remedy.
There is also sometimes present "burning along the whole length of the spine." This burning is purely subjective, for there is no actual local increase of temperature. Another characteristic of Zincum Metallicum is, "twitching and jerking of various muscles." I spoke of this symptom when writing upon Ignatia Ignatia. I would place Zincum, Ignatia Ignatia and Agaricus Muscarius Agaricus in the van of all remedies for causing and curing these general twitchings.
Another symptom for which this is one of our best remedies is, general trembling. This is also from prostration.
The patient loses control over his motions, although he is not yet paralyzed. Paralysis may come later if this condition is not remedied.
Being left in a room alone, while sleeping and perspiring, she threw off her clothes, caught cold and relapsed. Of course the "last state of that patient was worse than the first." The bowels became enormously distended profuse haemorrhage occurred, which was finally controlled by Alumen Alumen, a low form of delirium came on, the prostration became extreme notwithstanding the haemorrhage was checked, until the following picture obtained -staring eyes rolled upward into the head, head retracted; complete unconsciousness, lying on back and sliding down in bed, twitching, or rather intense, violent trembling all over, so that she shook the bed. I had nurses hold her hands night and day, she shook and trembled so.