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Materia Medica Viva Volume 3 – page 540

Abdomen
We can say in general that in every pathological condition or activity (pregnancy) that is centered in the abdomen we shall see this peculiar tenderness, soreness, bruised feeling, a great sensitivity with aversion to being touched. There is pain with every cough, with every step or jar.
The movements of the fetus are felt intensely and keep the woman awake the whole night. Movements of the fetus cause nausea and vomiting.
A keynote of Amica in the abdomen is a feeling of sore, bruised, tenderness in the inguinal region that forces the patient to walk in a bent position. It has the same sore bruised tenderness in the abdomen during stool. Dull pain in inguinal region on coughing. In inflammatory conditions of the abdomen, liver, intenstines, appendix etc there is a lot of tympanitic distension with frequent urging for stool with prostration, uneasiness and great sensitivity. Distension of abdomen after supper. Anxiety felt in the hypochondria. Twitching and jerking in hypogastrium.
Abdomen has crusts; scales; vesicles.
Rectum
Offensiveness is a great characteristic of Arnica: Offensive flatus that smells like spoiled eggs. Stool extremely offensive. Has diarrhea after injuries, after emotional upheavals. Diarrhea the whole night. Involuntary stool at night during sleep. Obstinate constipation where the rectum feels loaded with stool but feces are expelled with great difficulty. Pressure in rectum while standing. Stool fermented, like brown yeast, undigested, bloody, with mucus. Black watery stools with black vomit.
Urinary organs
Arnica is one of the main remedies for retention of urine after exertion, after injuries like concussion of the brain or a violent accident. Suppression of urine from concussion of spinal column. Inflammation of bladder after injuries.
Some of the labor after-effects could be: Dribbling of urine [by drops] after labor. Involuntary urination after labor. Has dribbling of urine, night and day after labor.
Involuntary urination while running. Retention of urine in chill; during colic. Chilliness after urination. Ineffectual urging to urinate during chill. Itching sensation in anterior part of urethra. Brown sediment in urine. Urine is black like ink.