What are true signs of someone who is bipolar?

Bipolar: Manic depression is a mood disorder that presents with extreme highs & lows, with at least few weeks of manic phases (abnormally elevated mood & energy level) alternating with few or more weeks of depressed phases (sad, guilty, hopeless/helpless, changes in sleep/appetite/energy level). Any phase can be severe enough to experience delusions or hallucinations.

Bipolar symptoms.: Mania or hypomania 1 may show aggression, agitation, v judgment ; impulse control, distractability, rapid thoughts ; speech, ^ libido, v sleep, spending sprees, high risk behaviors, elation, ^ physical activity or psychosis. When depressed 1 may have v mood, v energy level, v concentration, amotivation, ^ or v sleeping, ^ or v in appetite, poor self esteem, feelings of hopelessness or helplessness.