Lactic acid buildup in muscles does not make muscles tired and may even make muscle contract more efficientlIt forms when the body breaks down carbohydrates to use for energy when oxygen levels are low. Conditions that can increase lactic acid levels include: Heart Failure, Liver disease, Lung disease, Not enough blood containing oxygen getting to a certain area of the body Severe infection that affects the entire body (sepsis) Very low levels of oxygen in the blood (hypoxia)

Lactic acid buildup in muscles does not make muscles tired and may even make muscle contract more efficientlIt forms when the body breaks down carbohydrates to use for energy when oxygen levels are low. Conditions that can increase lactic acid levels include: Heart Failure, Liver disease, Lung disease, Not enough blood containing oxygen getting to a certain area of the body Severe infection that affects the entire body (sepsis) Very low levels of oxygen in the blood (hypoxia)