Tics are sudden, repetitive movements or sounds that a person makes involuntarily or semi-voluntarily. They can be as subtle as repeated eye blinking or as noticeable as jerking an arm or shouting a word. Tics are remarkably common in children, with roughly 1 in 5 school-age kids experiencing some form of tic at some point, though most are mild and temporary.
Motor Tics vs. Vocal Tics
Tics fall into two broad categories: motor tics, which are movements of the body, and vocal tics, which are sounds made with the voice. Motor tics include things like eye blinking, shoulder shrugging, head jerking, or facial grimacing. Vocal tics include throat clearing, sniffing, humming, grunting, or repeating specific words or phrases.
Within each category, tics range from simple to complex. Simple tics involve just one or two muscle groups and are brief. Squinting, nose twitching, or a single sniff are all simple tics. Complex tics recruit several parts of the body in a coordinated pattern, like bobbing the head while jerking an arm and then jumping. Complex vocal tics can involve repeating phrases, echoing what someone else said, or in rare cases, blurting out inappropriate words.
What a Tic Actually Feels Like
Most people assume tics come out of nowhere, but the majority of people with tics describe a buildup of sensation right before one happens. This is called a premonitory urge, and it can feel like pressure, tension, energy, or an itch-like discomfort in a specific part of the body. Performing the tic temporarily relieves that sensation, similar to how scratching an itch brings momentary relief. This is why tics are sometimes described as “semi-voluntary.” The person may be able to suppress the urge for a while, but the tension typically grows until the tic is eventually released.
Children under age 10 often can’t articulate or even recognize the premonitory urge, which is one reason younger kids’ tics may look more involuntary. As children get older, awareness of the urge tends to increase, and this awareness actually becomes useful in treatment.
Why Tics Happen
Tics originate in the brain’s movement-control circuitry, specifically the loop that connects the outer brain (cortex) to deeper structures involved in filtering and selecting movements. In a brain without tics, this circuit acts like a gatekeeper, allowing intended movements through while suppressing unintended ones. In people with tic disorders, a small abnormal burst of activity in the deeper filtering structures essentially tricks the gate into opening, releasing a movement or sound that wasn’t intended.
Dopamine, the brain chemical most associated with motivation and movement, plays a central role. People with tic disorders appear to have an overreactive dopamine system, where dopamine is released in exaggerated bursts. This is supported by the fact that medications blocking dopamine activity can reduce tics. Other brain chemicals involved in this circuit, including those responsible for excitatory and inhibitory signaling, also appear to be altered. Postmortem studies of people with Tourette syndrome have found reduced numbers of certain nerve cells in the movement-filtering region that are responsible for fine-tuning signals.
Tic Disorders and Tourette Syndrome
Not every tic means a person has a tic disorder. Many children develop transient tics that last a few weeks or months and then disappear on their own. A tic disorder is diagnosed when tics persist for a year or longer. There are two main categories:
- Persistent (chronic) tic disorder: one or more motor tics or vocal tics (but not both) lasting at least a year, with onset before age 18.
- Tourette syndrome: at least two motor tics and at least one vocal tic, lasting at least a year, with onset before age 18. The tics don’t need to occur simultaneously.
About 1 in 162 children (0.6%) have Tourette syndrome when both diagnosed and undiagnosed cases are counted. The number drops to about 1 in 333 when counting only those who’ve received a formal diagnosis. Boys are diagnosed roughly three to four times more often than girls. In most cases, tics peak in severity during the early teen years and then gradually decrease through late adolescence and early adulthood. Some people see their tics disappear entirely, while others continue to experience them as adults, and a smaller number find that tics worsen later in life.
Conditions That Often Accompany Tics
Tic disorders rarely travel alone. More than a third of people with Tourette syndrome also have obsessive-compulsive disorder (OCD), characterized by intrusive thoughts and repetitive behaviors. ADHD is even more common, affecting a majority of people diagnosed with Tourette syndrome. Anxiety, learning difficulties, and mood disorders also occur at higher rates. These co-occurring conditions frequently cause more day-to-day difficulty than the tics themselves, which is why treatment often addresses the full picture rather than tics in isolation.
What Makes Tics Better or Worse
Tics tend to fluctuate, sometimes dramatically, from day to day and week to week. Stress, excitement, anxiety, fatigue, and illness can all increase tic frequency and intensity. Many people notice tics worsen when they’re talking about them or when someone draws attention to them. Conversely, tics often decrease during focused, absorbing activities like playing a sport, reading, or playing music. Sleep generally suppresses tics, though they don’t always disappear completely during rest.
This waxing and waning pattern can be confusing for families. A child might go weeks with barely noticeable tics and then have a stretch where tics are constant and intense. This is the natural course of the condition, not a sign that something new is wrong.
How Tics Are Treated
Many tics, especially mild ones, don’t require treatment at all. When tics cause pain, interfere with school or work, or create significant social distress, treatment focuses on reducing their impact rather than eliminating them entirely.
The first-line approach recommended by experts is a structured form of behavioral therapy called Comprehensive Behavioral Intervention for Tics (CBIT). In CBIT, a therapist helps you become more aware of the premonitory urge that precedes each tic, then teaches you to perform a specific competing movement that makes the tic physically difficult to carry out. For example, someone with a head-jerking tic might practice gently tensing their neck muscles in a way that blocks the jerk. CBIT also involves identifying situations that trigger or worsen tics and finding strategies to manage them. Its effectiveness is comparable to medication, but without the side effects. It’s not a cure, and it doesn’t work for everyone, but for many people it significantly reduces tic severity.
When behavioral therapy isn’t enough or isn’t accessible, medications can help. The most effective class works by reducing dopamine activity in the brain, which can substantially decrease tics but may cause side effects like weight gain or drowsiness. Blood pressure medications originally designed for other purposes can help with milder tics and are sometimes preferred in children because of their gentler side effect profile. For isolated tics confined to a single muscle group, injections that temporarily relax the affected muscle are occasionally used. When ADHD coexists with tics, stimulant medications for attention can sometimes increase tics, so treatment requires careful balancing.
Living With Tics
For most people, tics are a manageable part of life rather than a defining limitation. The social dimension is often the hardest aspect, particularly for children. Peers may stare, ask questions, or tease, and the self-consciousness of having visible or audible tics can be more distressing than the tics themselves. Education helps: when classmates, teachers, and coworkers understand that tics are involuntary and not something the person can simply stop, the social pressure decreases substantially.
Suppressing tics for extended periods is possible for many people but exhausting. It’s been compared to holding back a sneeze for hours. The tics often come out in a burst once the person is in a safe or private environment, which is why parents sometimes hear that their child “never tics at school” but then see intense tics the moment the child gets home.