Respiratory acidosis is a condition that occurs when the lungs cannot remove all of the carbon dioxide produced by the body. This creates a disruption in the body's acid-base balance. Body fluids become excessively acidic.

Respiratory acidosis can result from lung diseases such as chronic obstructive pulmonary disease (COPD) and severe asthma.

Other conditions that may lead to respiratory acidosis include:

• Obesity hypoventilation syndrome  
• Excessive fatigue or weakness of the rib cage muscles
• Severe deformities of the spine and rib cage such as severe scoliosis
• Airway obstruction

Chronic respiratory acidosis occurs over a long period of time. This leads to a stable situation. This is because the kidneys increase chemicals that help restore the body's acid-base balance.

Acute respiratory acidosis is a severe condition in which the carbon dioxide builds up very quickly.

Symptoms may include shortness of breath, easy fatigue, chronic cough, or wheezing.

When respiratory acidosis becomes severe, confusion, irritability, or lethargy may occur.

A chest x-ray or CT scan may be done to diagnose possible lung disease.  

Pulmonary function tests   may help diagnose lung disease.

Arterial blood gases can tell how bad the respiratory acidosis is, and may detect abnormal oxygen levels.