Lactic acidosis causes
Pro Research Analysisby 
Searched over 200M research papers
Lactic Acidosis Causes: Hypoxia, Metabolic Dysfunction, and Drug Effects
Tissue Hypoxia and Shock as Primary Causes of Lactic Acidosis
The most common cause of lactic acidosis is tissue hypoxia, which results from inadequate oxygen delivery to tissues. This can occur due to circulatory, respiratory, hematologic, or cellular dysfunction, leading to overproduction of lactic acid. Shock—whether septic, cardiogenic, hypovolemic, or obstructive—is frequently identified as the leading cause, with lactic acidosis often developing early in the course of shock, sometimes even before other clinical signs such as low blood pressure or reduced urine output appear 1378.
Impaired Lactate Clearance: Liver and Kidney Dysfunction
Lactic acid is primarily metabolized by the liver, with the kidneys also playing a role in its clearance. Conditions that impair liver or kidney function, such as liver disease or acute kidney injury, can reduce the body’s ability to clear lactate, contributing to lactic acidosis. Hepatic underperfusion, often seen in shock or severe illness, further exacerbates this problem 1379.
Type A vs. Type B Lactic Acidosis: Hypoxic and Non-Hypoxic Mechanisms
Lactic acidosis is classified into two main types:
- Type A (Hypoxic): Caused by tissue hypoxia, as seen in shock, sepsis, severe anemia, or respiratory failure.
- Type B (Non-Hypoxic): Occurs without obvious hypoxia and can result from drug side effects, toxins, metabolic disorders, enzymatic defects (such as thiamine deficiency), malignancies, and certain inherited or acquired conditions 2345+3 MORE.
Drug and Toxin-Induced Lactic Acidosis
Certain medications and toxins can cause lactic acidosis. Notably, biguanide drugs like phenformin (and to a lesser extent, metformin) are associated with increased risk, especially in patients with underlying renal or cardiac dysfunction. Other drugs, such as those that inhibit gluconeogenesis or uncouple oxidative phosphorylation, can also contribute. Rarely, intoxication with substances like cannabis or synthetic cannabinoids has been reported as a cause 357.
Thiamine Deficiency as a Reversible Cause
Thiamine (vitamin B1) deficiency is a recognized, reversible cause of lactic acidosis. Thiamine is essential for the function of pyruvate dehydrogenase, an enzyme critical for aerobic metabolism. Deficiency impairs lactate utilization, leading to accumulation. This can occur in the context of malnutrition, chronic illness, malignancy, or after prolonged illness, and responds rapidly to thiamine supplementation 246.
Disease-Specific Causes: Diabetes, Malaria, and Others
Lactic acidosis can also be seen in specific diseases:
- Diabetes Mellitus: Poorly controlled diabetes, especially during diabetic ketoacidosis (DKA), can lead to lactic acidosis due to compromised tissue perfusion, stress responses, and rare complications like glycogenic hepatopathy 110.
- Malaria: In severe malaria, increased lactate production results from parasite metabolism, immune cell activation, tissue hypoxia due to anemia, and impaired hepatic and renal clearance .
- Other Conditions: Leukemia, glycogen storage diseases, and ethanol ingestion are also associated with lactic acidosis .
Conclusion
Lactic acidosis is most commonly caused by tissue hypoxia due to shock or severe illness, but can also result from impaired lactate clearance, drug or toxin exposure, thiamine deficiency, and specific diseases such as diabetes and malaria. Early identification and treatment of the underlying cause are crucial for improving outcomes in affected patients 1234+6 MORE.
Sources and full results
Most relevant research papers on this topic