What causes someone to blackout after a fit of coughing?

Blackouts after a fit of coughing can occur due to a sudden drop in blood pressure, which may result from the intense pressure and strain on the body during prolonged coughing. This can lead to reduced blood flow to the brain, causing fainting or loss of consciousness. Additionally, hyperventilation during coughing may decrease carbon dioxide levels in the blood, contributing to dizziness or fainting. It's essential to consult a healthcare professional if such episodes occur frequently.