This document discusses substance use disorders and related topics. It notes that over 16.6 million Americans have an alcohol use disorder, and nearly 88,000 people die each year from alcohol-related causes. Substance abuse is difficult to determine precisely due to unreported cases. Types of substances that can be abused include alcohol, sedatives, stimulants, cannabis, opioids, hallucinogens, and inhalants. The causes of substance abuse involve biological, psychological, social, and environmental factors. Different substances cause various intoxication, withdrawal, and overdose symptoms that require medical management.