Restlessness is a state of unease marked by an urge to move, difficulty staying still, or a feeling of being “keyed up” that you can’t quite shake. It can be purely internal, like a buzzing sensation of discomfort with no visible signs, or it can show up as pacing, fidgeting, leg bouncing, or other repetitive movements you feel unable to control. Nearly everyone experiences restlessness occasionally, but when it becomes persistent or intense, it often points to an underlying physical or psychological cause worth understanding.
The Two Faces of Restlessness
Restlessness isn’t a single experience. It splits into two distinct forms that can overlap. Subjective restlessness is the internal version: a diffuse sense of unease, the feeling that something is off, an inability to relax even when nothing specific is wrong. You might describe it as feeling wired, on edge, or mentally unable to settle. Other people can’t necessarily see it.
Objective restlessness is the visible kind. It shows up as disorganized or nonproductive movement: shifting in your chair, crossing and uncrossing your legs, pacing a room, or tapping your hands. In clinical terms, this is sometimes called psychomotor agitation. The key feature is that the movement feels driven rather than chosen. You’re not fidgeting because you’re bored; you’re fidgeting because staying still feels genuinely uncomfortable.
Many people experience both at once. The inner unease fuels the outward movement, and the inability to stop moving reinforces the feeling that something is wrong.
Anxiety and Mood Disorders
Restlessness is one of the core diagnostic features of generalized anxiety disorder. To meet the clinical threshold, a person needs to experience anxiety and worry on more days than not for at least six months, along with three or more associated symptoms. “Restlessness or feeling keyed up or on edge” is listed first among those symptoms. It’s that persistent, which is why people with chronic anxiety often describe restlessness as their baseline state rather than something that comes and goes.
Depression can also produce restlessness, particularly in episodes that involve psychomotor agitation. This sometimes surprises people who associate depression only with low energy and withdrawal. But agitated depression is common, and the restlessness it brings can be intense: an inability to sit through a movie, a compulsion to stand up and move during conversations, or lying in bed feeling physically uncomfortable despite being exhausted.
Restless Legs Syndrome
Restless legs syndrome (RLS) is one of the most recognizable physical causes of restlessness, and it has a very specific pattern. The International Restless Legs Syndrome Study Group identifies five criteria that define it:
- A strong, often irresistible urge to move the legs, usually accompanied by uncomfortable sensations like crawling, pulling, or aching.
- Symptoms start or worsen during rest, particularly when sitting or lying down.
- Movement provides temporary relief. Walking, stretching, or shifting position helps, at least briefly.
- Symptoms are worse at night.
- No other medical or behavioral condition fully explains the symptoms.
RLS affects an estimated 5 to 10 percent of adults to some degree. It’s more than annoyance. Severe cases make it nearly impossible to fall asleep or stay asleep, leading to chronic fatigue that compounds the restlessness during the day.
Iron status plays a significant role. The International Restless Legs Syndrome Study Group uses a ferritin level below 50 micrograms per liter as a threshold for iron deficiency relevant to RLS, even when hemoglobin is normal and you wouldn’t be considered anemic by standard measures. In other words, your iron stores can be low enough to drive restless legs long before a routine blood test flags a problem. If you have RLS symptoms, asking specifically about ferritin (not just a basic blood count) is worth doing.
Medication-Induced Restlessness
Some medications cause a specific form of restlessness called akathisia. The word comes from Greek, literally meaning “inability to sit.” People with akathisia feel an intense, uncontrollable inner restlessness that drives repetitive movement, especially in the lower body: rocking from foot to foot, marching in place, or an inability to keep the legs still. Unlike anxiety-driven restlessness, akathisia doesn’t come with fear or worry. It’s purely a compulsion to move.
Akathisia is the most common movement disorder linked to antipsychotic medications, particularly older “first-generation” antipsychotics at high doses. But it’s not limited to that class. SSRIs, the most widely prescribed antidepressants, can cause it too. So can older antidepressant types like tricyclics and MAOIs, the anti-anxiety medication buspirone, and stimulant drugs including amphetamines and cocaine.
What makes akathisia tricky is timing. It often appears within days to weeks of starting a new medication or increasing a dose, and it can easily be mistaken for worsening anxiety, leading to a dose increase that makes things worse. If restlessness appears shortly after a medication change, that connection is important to flag.
ADHD and Internal Restlessness
In children, ADHD-related restlessness is hard to miss: running, climbing, inability to stay seated. In adults, it changes shape. The overt hyperactivity often fades, but the internal restlessness remains. Adults with ADHD frequently describe a mental motor that won’t turn off, a feeling of needing to always be doing something, or discomfort during activities that require sustained stillness like meetings, flights, or waiting rooms.
This internal version of restlessness is easy to overlook or attribute to stress. Many adults with undiagnosed ADHD have spent years assuming everyone feels this way. The distinguishing feature is that it’s persistent across situations and has been present since childhood, even if it wasn’t recognized at the time.
Other Physical Triggers
A range of medical conditions can produce restlessness as a symptom. Hyperthyroidism speeds up metabolism and produces a jittery, wired feeling that’s often accompanied by a racing heart, weight loss, and heat intolerance. Caffeine and other stimulants produce restlessness through a similar mechanism of nervous system activation. Blood sugar swings, particularly the crash after a spike, can trigger agitation and an inability to settle. Withdrawal from alcohol, benzodiazepines, or opioids commonly includes severe restlessness as an early symptom.
Dehydration and electrolyte imbalances also contribute, though these tend to produce a milder, more generalized sense of unease rather than the intense driven quality of akathisia or RLS.
What Helps Reduce Restlessness
The most effective approach depends entirely on the cause, which is why identifying the trigger matters more than treating the symptom in isolation. That said, certain lifestyle strategies have broad support. A large meta-analysis of randomized clinical trials found that lifestyle interventions including regular physical activity, dietary improvements, and better sleep habits produced statistically significant reductions in anxiety and stress. The mechanism is straightforward: exercise lowers cortisol and increases endorphins, both of which directly counteract the physiological state that drives restlessness.
Sleep quality and restlessness have a bidirectional relationship. Poor sleep increases daytime restlessness, and restlessness (especially from RLS or anxiety) disrupts sleep, creating a cycle that feeds itself. Breaking that loop from either direction helps. Consistent sleep and wake times, limiting caffeine after early afternoon, and keeping the bedroom cool and dark are starting points that sound basic but measurably shift the balance.
For restlessness tied to specific conditions, targeted treatment makes the biggest difference. Correcting low iron stores can resolve or significantly improve RLS. Adjusting or switching a medication that’s causing akathisia typically brings relief within days to weeks. Treating the underlying anxiety or mood disorder addresses restlessness at its source rather than at the surface. The common thread is that persistent restlessness is worth investigating rather than powering through. It’s a signal, and the signal usually has a traceable origin.