Acute respiratory distress syndrome (ARDS) is a severe, life-threatening condition that causes sudden respiratory failure due to inflammation and fluid buildup in the lungs. It is typically caused by conditions such as pneumonia, sepsis, or trauma. ARDS is characterized by rapid onset of symptoms such as severe shortness of breath, low oxygen levels in the blood, and rapid breathing. Treatment typically involves providing oxygen support, managing fluid levels, and treating the underlying cause of the condition.