Heart Attack and Tongue Biting/Swelling: Mechanism Explained

During cardiac arrest or massive heart attack, sudden loss of cerebral perfusion causes:

• Loss of consciousness → loss of voluntary muscle control.
• Involuntary jaw closure (tonic-clonic activity or reflex) → tongue biting.
• Facial/jaw muscle relaxation → tongue may protrude, appear enlarged or swollen due to venous congestion and loss of tone.

These are secondary signs of global cerebral hypoxia, not primary cardiac symptoms. Immediate CPR and defibrillation are critical.