Coma in patients with uremia is a more serious complication, but the exact number of days to pass away varies from person to person. For example, if the patient’s vital signs are stable, blood pressure and heart rate are maintained in normal range, and breathing is normal, it may take a few days or a week, or even longer, before death occurs. If a patient with uremia is in a coma, has a decreased blood pressure and heart rate, and is breathing shallowly and slowly, he or she may die within a few hours. The main common causes of coma in uremia are: 1. the accumulation of toxin levels leads to uremic encephalopathy, causing coma. 2. coma occurs due to disorders of acid-base balance or serious disorders of electrolytes in the body, such as severe metabolic acidosis or severe hyperkalemia. 3. patients with uremia may be induced to suffer from cerebral hemorrhage or massive cerebral infarction, leading to coma. 4. The patient may be in a coma due to the presence of a brain hemorrhage or a large cerebral infarction.