Vitamin C (Ascorbic Acid) Toxicity

Ingestion of megadoses of vitamin C supplements exceeding 2 grams per day.

Administration of intravenous high-dose vitamin C for alternative cancer or infection treatments.

Chronic use of high-dose oral vitamin C for immune support or cold prevention.

Sudden increase in vitamin C intake in patients with renal insufficiency.

Concurrent use of vitamin C with iron supplements in patients with iron overload.

Symptoms typically develop within hours to days after ingestion of toxic doses.

Oxalate nephropathy may manifest after days to weeks of sustained high intake.

Gastrointestinal symptoms often appear within hours of ingestion.

Hemolytic anemia in G6PD deficiency can occur within 1 to 3 days of exposure.

Iron overload complications develop over weeks to months with chronic excessive intake.

Symptoms are often attributed to common gastrointestinal illnesses rather than vitamin C toxicity.

Lack of awareness about vitamin C overdose among clinicians leads to missed diagnosis.

Non-specific symptoms such as diarrhea and abdominal pain delay consideration of toxicity.

Failure to obtain a detailed supplement history obscures the diagnosis.

Laboratory abnormalities like oxalate crystals may be overlooked or misinterpreted.

Gastrointestinal upset including diarrhea, nausea, and abdominal cramps.

Kidney stones causing flank pain and hematuria due to oxalate crystal deposition.

Fatigue and malaise from renal dysfunction in severe toxicity.

Headache and flushing with very high doses of vitamin C.

Increased risk of hemolysis in patients with glucose-6-phosphate dehydrogenase deficiency.

Patients report acute onset of diarrhea, abdominal cramps, and nausea after high-dose vitamin C ingestion.

Some present with flank pain and hematuria due to oxalate nephropathy.

In G6PD-deficient patients, symptoms include fatigue, pallor, and jaundice from hemolysis.

Patients with iron overload may report fatigue and joint pain due to exacerbated iron deposition.

History often reveals self-medication with large vitamin C doses for immune boosting or alternative therapies.

History of chronic kidney disease or renal impairment increases risk of oxalate accumulation.

Known G6PD deficiency predisposes to hemolytic complications.

Patients with hemochromatosis or other iron storage disorders are at risk of iron toxicity.

Prior episodes of nephrolithiasis may be relevant due to oxalate crystal formation.

Use of high-dose vitamin supplements or alternative medicine treatments.

Family history of G6PD deficiency increases risk of hemolytic anemia with vitamin C toxicity.

Hereditary hemochromatosis in family members predisposes to iron overload complications.

Family history of kidney stones may suggest susceptibility to oxalate nephropathy.

No direct inherited pattern of vitamin C toxicity, but genetic predispositions affect risk.

Relatives with renal disease may share increased vulnerability to oxalate accumulation.

Usually normal physical exam as toxicity is rare and often subclinical.

Signs of oxalate nephropathy such as flank tenderness may be present in severe cases.

Diarrhea and abdominal tenderness may be noted with gastrointestinal irritation.

Skin flushing or rash can occur rarely with high doses.

Signs of iron overload such as hepatomegaly may be seen if coexisting hemochromatosis is present.

Discontinuation of excessive vitamin C intake is the primary treatment to prevent further toxicity.

Hydration with intravenous fluids supports renal clearance of excess vitamin C and prevents kidney stone formation.

Monitoring and managing renal function is essential to avoid complications such as oxalate nephropathy.