Substance use and substance use disorder differ by the frequency of use and the effect on a person’s life. Substance use disorder is a mental health condition. Substance use refers to using both legal ...

“When I use a word,” one of 19th century British author and mathematician Lewis Carroll’s characters once said, “it means just what I choose it to mean — neither more nor less.” Though he was a ...

Substance use disorder makes it hard to stop using substances even when they're harmful. Using the term "substance use disorder" helps separate the person from the treatable illness. Substance use ...

Polysubstance use disorder is a mental health condition in which someone uses more than one substance at the same time or within a short period of time, despite a pattern of negative effects.

Nearly 19 million children in the United States have at least one parent with a substance use disorder, according to a new study published Monday in JAMA Pediatrics. And a significant number of those ...

Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder, affecting 12%–13% of adolescents in the United States, according to some studies. The pattern of inattention, ...