Rectum
Arsenicum frequently corresponds to cases of enteritis and dysenteric conditions characterized by frequent, black, offensive stools (cadaveric odor) which are burning and acrid, but not profuse. We must remember that Arsenicum is not "plethoric" in its excretions; scantiness is more the rule. The rectum and anus burn, and the burning can extend to the bowels. Diarrhea often results from cold drinks, fruit, and ice cream. Diarrheas are very offensive and are attended by anxiety, exhaustion and a very pale face.
Think of Arsenicum in cases of diarrhea such as the following: initially profuse stools which have been reduced at the expense of a general worsening of the patient by the prescription of several different remedies. As a consequence the patient is left completely exhausted; he feels almost dead, hardly breathes, is very cold, and now has scanty diarrheic stools.
The restlessness and exhaustion so characteristic of Arsenicum are most prominently exhibited in debilitating dysenteric conditions. During dysentery (or other diarrheas) there is frequent tenesmus with unbearable urging and great distress as a consequence of the pains; when in the throes of such suffering, the patient is tremendously anxious and thinks of death constantly.
Painful spasmodic protrusion of rectum. Constipation. Diarrhea alternating with scybalous stools of a whitish-clay color. Small, diarrhoic, offensive stools. Bilious dysentery with great exhaustion after every exertion. Black stools. Stool slimy, brownish. Anxiety felt in the abdomen which is not relieved by stool. Tremendously painful haemorrhoids protrude during stool and cause great exhaustion. They are big, like grapes, and bum like coals of fire. They feel very hot and may bleed easily. Haemorrhoids with stitching pain when walking or sitting, not when at stool; with burning pain relieved by heat. Fissures of the rectum that bleed after every stool. Pains as if stuck by red hot needles.
Violent burning in umbilical region, before and during loose stools, which consist of mucus. During stool: chilliness, nausea, vomiting. Involuntary stools and urine. Diarrhea after taking cold substances, particularly ice-cream. Cholera infantum; simultaneous vomiting and purging, great exhaustion; vomiting and purging aggravated by food and water. Purging with extreme coldness of the extremities.
Urinary organs
Arsenicum corresponds to involuntary urination, either during the day or at night with enuresis. There is also a peculiar paralysis of the bladder where, despite the sensation of fullness and distention of the bladder, there is no urge to void.
Paralysis of the bladder in elderly patients. Urine scanty. Burning in the urethra. Burning pain especially at the start of urination. A feeling of weakness in the abdomen after urination. Urination frequent during the cold stage in intermittent fever. Chronic cystitis, with retained urine; what passes is turpid and purulent. Urination after sweat, brown, soon turpid, but without sediment.