Why do people have too much co2 in their blood?

People can have too much carbon dioxide (CO2) in their blood, a condition known as hypercapnia, due to several factors, including respiratory disorders like chronic obstructive pulmonary disease (COPD) or Asthma, which impair gas exchange in the lungs. Other causes may include hypoventilation, where breathing is too shallow or slow, leading to inadequate removal of CO2. Additionally, certain conditions affecting the central nervous system can disrupt the body's ability to regulate breathing effectively.