Oxalicum acidum
Oxalic acid · Oxalic acid · Human-made/chemical
Oxalic ac. is used for those whose pains occur violently and briefly in localized areas of the body, and who generally feel worse for dwelling on them. They are nervous, confused, dizzy people, who often have trouble sleeping.
Usually the remedy is given for angina with palpitations that are worse for lying down. When those affected think about their heart, it seems to make it flutter or beat intermittently. In men, other symptoms that can be treated by Oxalic ac. include throbbing, crushing pain in the testes, and pain in the spermatic cord.
Key symptoms
- Pains very violent in small spots, worse from motion and thinking of them
- Rheumatism of left side with periodical remissions
- Terrible neuralgic pains in spermatic cord
- Spinal cord involvement producing motor paralysis
- Burning pain in epigastrium extending upward; slightest touch excruciating
- Spasmodic symptoms of throat and chest; neurasthenia
Worse (aggravation)
Better (amelioration)

Sorrel Acid
Although certain oxalates are constant constituents of vegetable food and of the human body, the acid itself is a violent poison when taken internally, producing gastro-enteritis, motor paralysis, collapse, stupor and death. Influences the spinal cord, and produces motor paralysis. Pains very violent, in spots (Kali bich) worse, motion, and thinking of them. Periodical remissions. Spasmodic symptoms of throat and chest. Rheumatism of left side. Neurasthenia. Tuberculosis.
Head
Sense of heat. Confusion and vertigo. Headache, before and during stool.
Eyes
Severe pain in eyes; feel expanded. Hyperæsthesia of retina.
Stomach
Violent pain in epigastrium, discharge of flatus relieves. Gastralgia, pyrosis, sensation of coldness below epigastrium. Burning pain, extending upwards; slightest touch causes excruciating pain. Bitter and sour eructation, worse at night. Cannot eat strawberries.
Abdomen
Pain in upper part and region of navel two hours after eating, with much flatulence. Stitches in liver. Colic. Burning in small spots in abdomen. Diarrhœa from coffee.
Male
Terrible neuralgic pains in spermatic cord. Testicles feel contused and heavy. Seminal vesiculitis.
Urinary
Frequent and copious. Burning in urethra and pain in glans when urinating. Must urinate when thinking of it. Urine contains oxalates.
Respiratory
Nervous aphonia with cardiac derangement (Coca; Hydrocy ac). Burning sensation from throat down. Breathing spasmodic, with constriction of larynx and chest. Hoarseness. Left lung painful. Aphonia. Paralysis of the tensors of vocal cord. Dyspnœa; short, jerking inspirations. Sharp pain through lower region of left lung, extending down to epigastrium.
Heart
Palpitation and dyspnœa in organic heart disease; worse, when thinking of it. Pulse feeble. Heart symptoms alternate with aphonia, angina pectoris; sharp, lancinating pain in left lung coming on suddenly, depriving of breath. Præcordial pains which dart to the left shoulder. Aortic insufficiency.
Extremities
Numb, weak, tingling. Pains start from spine and extend through extremities. Drawing and lancinating pains shooting down extremities. Backache; numb, weak, Myelitis. Muscular prostration. Wrist painful, as if sprained (Ulmus). Lower extremities blue, cold, insensible. Sensation of numbness. Multiple cerebral and posterior spinal sclerosis. Lancinating pains in various parts; jerking pains.
Skin
Sensitive, smarting and soreness, worse shaving; mottled, marbled in circular patches. Perspires easily.
Modalities
Worse, left side; slightest touch; light; shaving. Aroused about 3 am with gastric and abdominal pain. All conditions made worse by thinking about self.
Relationship
Compare: Ars; Colch; Arg; Pic ac; Cicer arietinum-Chick-pea--(Lithiasis, jaundice, liver affections; diuretic). Scolopendra-Centipede--(terrible pains in back and loins, extending down limbs; return periodically, commencing in head, to toes. Angina pectoris. Inflammation, pain and gangrene. Pustules and abscesses). Cæsium--(Pain in lumber region and testicle. Headache, darting through temples. Diarrhœa and colic. Languor).
Lime Water-Antidote to poisoning of Oxal acid.
Dose
Sixth to thirtieth potency.

Generals
This remedy has been greatly neglected.
It will cure many heart complaints that are treated with vague, crude, unproved remedies with indifferent results. The violent action upon the heart racks the whole system. Trembling, convulsions, loss of sensation; numbness of the body and limbs; blueness of the lower limbs, fingers and lips; paralysis of the limbs are symptoms showing how violently this remedy takes hold of the body, affecting the heart, spinal cord and brain. Symptoms are worse from exertion and motion. The patient is sensitive to cold air. Symptoms come on in paroxysms. Palpitation alternates with loss of voice.
Pains
No remedy produces more violent pains; cutting, shooting, stitching, tearing pains in many parts; sores and bruises all over the body; burning in forehead, stomach, abdomen, throat, urethra, hands and feet; painful spots on the scalp, sore to, touch, also in other places.

Oxalic Acid. Hydrogen Oxalate. C2H2O42H2O. Trituration. Tincture.
Clinical
Angina pectoris. Back, pain in. Chest, affections of. Cholera infantum. Convulsions. Deltoid rheumatism. Enuresis. Eyes, affections of. Gastrodynia. Gout. Gravel. Hernia. Indigestion. Meningitis. Myelitis. Nails, blue. Neuralgia. Neurasthenia. Nose, affections of. Numbness. Oxaluria. Paralysis. Pregnancy, sickness of. Side, pain in. Spasms. Spermatic cord, neuralgia of. Stomach, affections of. Tetanus. Testicles, induration of; pains in. Tongue, affections of. Urine, abnormal. Voice, altered.
Characteristics
If Opium is the painless remedy, Oxal. ac. may be considered its antithesis: it causes pains excruciating beyond description, and it has this grand keynote distinction, that its pains are all < when the patient thinks of them. And not only that, thinking of pains and conditions will bring them on when they are not actually present. If the patient thinks about urinating he must go instantly and relieve the bladder. …

Respiratory Organs
Sharp pains through the lower lobe of the left lung.
Heart and Pulse
Heart intermits when thinking of it.
Generalities
Pain in small circumscribed spots, or confined to small spots.
Causes and Modalities
Complaints < when thinking of them.

Phatak's chapter on Oxalicum acidum is available in the app.
Read Phatak in the appClassical texts are in the public domain. Educational reference only — not medical advice.