10 Subtle Signs of Bipolar Disorder : No. 7 - Alcohol or Drug Abuse

When it comes to mental illness, there are plenty of stereotypes. But in reality, mood disorders can be hard to pinpoint—particularly in people with bipolar disorder symptoms. 

"Chalking it up to moodiness or trouble at work or tiredness is pretty common," says Carrie Bearden, PhD, an associate professor in residence of psychiatry and behavioral sciences and psychology at the David Geffen School of Medical at UCLA. "The disorder varies in severity."

Here are 10 signs that mood problems may be due to more than a quirky or difficult personality.

7-Alcohol or drug abuse

About 50% of people with bipolar disorder also have a substance abuse problem, particularly alcohol use, Dr. Bearden says.

Many people will drink when they are in a manic phase to slow themselves down, and use alcohol to improve their mood when they are depressed.

Next: Erratic behavior