Respiratory Diseases
Chronic lung conditions like chronic obstructive pulmonary disease (COPD), asthma, pneumonia, and pulmonary fibrosis can limit how well oxygen moves from the lungs into the bloodstream. Because these conditions often develop gradually, declining oxygen levels may go unnoticed at first.
Cardiovascular Problems
Heart conditions can reduce how efficiently oxygen-rich blood is circulated throughout the body. Even if the lungs are working properly, issues such as heart failure or congenital heart defects may prevent organs from receiving enough oxygen.
