Oxalicum Acidum is a homeopathic remedy for weak digestion, back pain, rheumatism. Modalities:: WORSE from thinking of symptoms; mental exertion; motion; strawberries; sour fruits; grapes; left side; slightest touch; light; shaving; cold; being aroused about 3 a.m. with gastric and abdominal pain. Lying down causes swimming sensation; worse evening; night and early morning. BETTER after stools; change of position helps pain in back. SOURCE: Robin Murphy Lotus Materia Medica
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