Cirrhosis is the endpoint in patients who have chronic progressive liver disease. Patients with abnormal liver function who develop ascites, variceal hemorrhage, hepatic encephalopathy or renal impairment are considered to have end-stage liver disease (ESLD). While liver transplantation is a viable treatment option for ESLD, with increasing waiting times for organ transplantation, nearly 17% of patients on the transplant wait list die annually; others are not candidates for a liver transplant. Patients with ESLD have a constellation of symptoms and disease-related complications that affect survival and health-related quality of life. When a substance or disease attacks and damages the liver, liver cells are killed and scar tissue is formed. This scarring process is called fibrosis (pronounced "fi-bro-sis"), and it happens little by little over many years. When the whole liver is scarred, it shrinks and gets hard. This is called cirrhosis, and usually this damage cannot be undone. Any illness that affects the liver over a long period of time may lead to fibrosis and, eventually cirrhosis. Some common causes are heavy drinking, viruses, a buildup of fat in the liver, inherited diseases, toxic effects from drugs and autoimmune diseases. These are more fully explored in the next section. Cirrhosis has numerous causes. In the United States, heavy alcohol consumption and chronic hepatitis C have been the most common causes of cirrhosis. Obesity is becoming a common cause of cirrhosis, either as the sole cause or in combination with alcohol, hepatitis C, or both. Many people with cirrhosis have more than one cause of liver damage. Cirrhosis is not caused by trauma to the liver or other acute, or short-term, causes of damage. Usually years of chronic injury are required to cause cirrhosis. Most people who consume alcohol do not suffer damage to the liver. But heavy alcohol use over several years can cause chronic injury to the liver. The amount of alcohol it takes to damage the liver varies greatly from person to person. For women, consuming two to three drinks-including beer and wine-per day and for men, three to four drinks per day, can lead to liver damage and cirrhosis. In the past, alcohol-related cirrhosis led to more deaths than cirrhosis due to any other cause. Deaths caused by obesity-related cirrhosis are increasing. The hepatitis C virus is a liver infection that is spread by contact with an infected person's blood. Chronic hepatitis C causes inflammation and damage to the liver over time that can lead to cirrhosis. The hepatitis B virus is a liver infection that is spread by contact with an infected person's blood, semen, or other body fluid. Hepatitis B, like hepatitis C, causes liver inflammation and injury that can lead to cirrhosis. The hepatitis B vaccine is given to all infants and many adults to prevent the virus. Hepatitis D is another virus that infects the liver and can lead to cirrhosis, but it occurs only in people who already have hepatitis B. In NAFLD, fat builds up in the liver and eventually causes cirrhosis. This increasingly common liver disease is associated with obesity, diabetes, protein malnutrition, coronary artery disease, and corticosteroid medications.