The cause of purple lips may vary depending on the accompanying symptoms, such as.
When accompanied by respiratory distress, which is common in severe lung and heart disease and acute airway obstruction, massive pneumothorax, etc.
with pestle-like fingers (toes), commonly in cyanotic congenital heart disease and certain chronic lung diseases
with symptoms of impaired consciousness, commonly associated with certain drugs or chemical poisoning, shock, acute lung infection or acute heart failure.
Prompt medical attention is recommended.