Another danger is "withdrawal", which can happen when a person stops using heroin. As with other addictions, withdrawal is a painful, unpleasant process that involves physical and mental symptoms. Withdrawal is most common when people stop using heroin suddenly, or when a person who has been using heroin for a while tries to stop. However, a person can have withdrawal symptoms even after using heroin for just 3 days. Physical symptoms often include bad body aches, hot and cold sweats, chills, restlessness, diarrhea, and problems with eating and sleeping. These withdrawl symptoms are sometimes called "cold turkey". Sometimes withdrawal feels like a very bad case of the flu. People can also have very strong psychological symptoms of withdrawal, like depression and strong cravings for heroin. Many heroin users are very afraid of withdrawal. Withdrawal - and fear of withdrawal - is one of the most common reasons why people have trouble quitting heroin. Medications like methadone and Suboxone are sometimes used to treat or prevent withdrawal symptoms, and to decrease cravings for heroin.