Yes, a person's behavior can change from nice to mean without necessarily having bipolar disorder. Various factors can influence behavior, including stress, personal circumstances, mental health issues like anxiety or depression, substance use, and environmental triggers. Sometimes, underlying emotional struggles or unresolved conflicts can lead to sudden changes in behavior. It’s essential to approach such changes with empathy and understanding, as they often indicate deeper issues that may require professional support. At Delhi Mind Clinic, we provide guidance and resources to help individuals navigate their emotional challenges. For more information on mental health, visit https://www.delhimindclinic.com/.