Green Froth at the Mouth After Death: Pulmonary Edema and Bile Reflux Explained

Green-tinged froth at the mouth/nose at or near death typically indicates severe pulmonary edema with bile-stained fluid.

Pathophysiology

1. Pulmonary edema: Fluid extravasation into alveoli due to hydrostatic pressure (left heart failure) or increased permeability (ARDS, sepsis, toxins).
2. Foam formation: Agitated fluid + surfactant = stable bubbles.
3. Green color: Bile reflux from duodenum into stomach → esophagus → pharynx → airways, mixing with edema fluid. Seen in supine position, impaired consciousness, or upper GI obstruction.

Common Causes

• Acute left ventricular failure (MI, arrhythmia)
• ARDS (sepsis, pneumonia, aspiration)
• Renal failure (volume overload)
• Neurogenic pulmonary edema (stroke, trauma)
• Opioid overdose (respiratory depression + aspiration)

Important

Frothy sputum can occur in living patients with acute pulmonary edema (e.g., flash pulmonary edema). It is a medical emergency requiring immediate intervention (oxygen, diuretics, vasodilators, ventilatory support).