ADHD and bipolar disorder can look strikingly similar in the moment — distractibility, impulsivity, racing thoughts, and bursts of energy show up in both. They also co-occur more often than chance, which makes the picture harder still. But the shape over time is different, and that shape is what separates them.
ADHD is a consistent, lifelong baseline: the traits are there most days, across situations, since childhood. Bipolar moves in episodes — distinct periods of elevated or depressed mood that differ from a person's usual self and last days to weeks. If the episodic pattern with real mood change sounds familiar, the bipolar screening is a useful first step; if it is steady, lifelong attention and focus problems, the adult ADHD test fits better.
| Aspect | ADHD | Bipolar disorder |
|---|---|---|
| Course over time | Constant, lifelong baseline | Episodic — distinct mood episodes |
| Mood | Reactive; shifts quickly with events | Sustained highs and lows lasting days to weeks |
| Energy/sleep | Restless, but sleep need is normal | In mania, reduced need for sleep with high energy |
| Onset | Symptoms present from childhood | Often emerges in late teens or twenties |
| Grandiosity/psychosis | Not features | Can occur during manic episodes |
| First-line treatment | Stimulants and behavioural strategies | Mood stabilisers (stimulants can destabilise untreated bipolar) |
ADHD is the weather you live in; bipolar is a front that moves through.
The distinction that matters most
Ask whether the symptoms are episodic or constant. ADHD does not come and go — someone with ADHD has been distractible and restless for as long as they can remember, in every setting. Bipolar arrives in episodes: a manic or hypomanic period is a change from baseline, with a genuinely different mood, not just more energy.
The "high" is also different in kind. ADHD restlessness is not euphoria and does not reduce the need for sleep; manic elevation often does both, and can include grandiosity or, at the severe end, psychosis. Those features, when present, point clearly toward bipolar.
Why getting it right is urgent
Treatment is the reason this matters so much. Stimulants — the mainstay of ADHD treatment — can trigger or worsen mania in someone with untreated bipolar disorder. So when both are suspected, clinicians typically stabilise mood first. Because the two can co-exist, a careful history is essential. A screening helps you bring an organised account to that conversation; it does not replace it.
Common questions
- Can you have both ADHD and bipolar?
- Yes, and it’s relatively common. When both are present, bipolar is usually stabilised first because stimulants can worsen untreated mania.
- What’s the quickest way to tell them apart?
- Episodic vs constant. Bipolar comes in mood episodes lasting days to weeks; ADHD is a steady, lifelong baseline present since childhood.
- Can a screening diagnose either one?
- No — screenings like the ASRS and a bipolar screen flag patterns worth assessing. Only a clinician can diagnose, which is especially important here because treatment differs.