Acidosis occurs when there is an excess of acid in the body fluids or a loss of bicarbonate, leading to a decrease in blood pH below the normal range (less than 7.35). It can be caused by several factors:

1. Metabolic Acidosis:

- Accumulation of metabolic acids such as ketones due to uncontrolled diabetes (diabetic ketoacidosis) or lactic acid due to conditions like lactic acidosis (e.g., sepsis, severe exercise, certain medications).

- Loss of bicarbonate through the kidneys due to conditions like renal tubular acidosis (RTA) or severe diarrhea.

2. Respiratory Acidosis:

- Occurs when the lungs cannot adequately eliminate carbon dioxide (CO2). This can happen in conditions that result in hypoventilation, such as pneumonia, chronic obstructive pulmonary disease (COPD), drug overdose, or respiratory depression.

3. Mixed Acidosis:

- A combination of metabolic and respiratory acidosis can occur in certain situations, making it more complex to manage.

It's important to identify the underlying cause of acidosis to determine the appropriate treatment. Acidosis can lead to various symptoms and complications if left unaddressed, including nausea, vomiting, confusion, impaired mental function, electrolyte disturbances, and potentially life-threatening conditions.