An alcoholic's behavior can vary significantly depending on the severity of their addiction. Generally, however, alcoholics can be prone to erratic and unpredictable behavior. This can manifest in the form of aggression, depression, and other mood swings. They may also display signs of poor impulse control, such as recklessness or impulse spending. In addition, alcoholics may struggle with relationships, work or school, and other aspects of life. They may also suffer from physical ailments related to their excessive drinking, such as liver damage, heart disease, and other health problems.