Early indicators of bipolar disorder in adolescents can be tricky to spot, as they often overlap with typical teenage behavior. However, there are some signs that might suggest the presence of bipolar disorder:

Extreme Mood Swings: Adolescents with bipolar disorder may experience dramatic shifts in mood, from intense highs (mania or hypomania) to severe lows (depression). These mood swings can occur without any obvious triggers.
Changes in Sleep Patterns: During manic episodes, teens might need very little sleep and still feel energetic. Conversely, during depressive episodes, they may sleep excessively and still feel tired2.
Impulsivity and Risky Behavior: Manic episodes can lead to impulsive decisions and risky behaviors, such as reckless driving, spending sprees, or substance abuse.
Irritability and Aggression: While irritability is common in teenagers, those with bipolar disorder may exhibit extreme irritability and aggression, especially during manic episodes.
Difficulty Concentrating: Both manic and depressive episodes can affect a teen's ability to concentrate, leading to poor academic performance.
Changes in Appetite and Weight: Significant changes in appetite and weight can occur during both manic and depressive episodes.
Feelings of Hopelessness or Worthlessness: During depressive episodes, teens may feel an overwhelming sense of hopelessness or worthlessness, which can sometimes lead to suicidal thoughts or behaviors.

If you notice these signs in an adolescent, it's important to seek professional help. Early diagnosis and treatment can make a significant difference in managing the condition and improving quality of life.