A tic is a repetitive and spasmodic contraction of the muscles, usually of the face. It appears as an uncontrollable movement of the body and may be referred to as a twitch, spasm, motor tic, or jerk. Examples may include blinking the eyes, grimaces, grunts, groans, tongue clicking, throat clearing, or twitching the nose. Tics can also occur outside the facial muscles in the arms or legs, but this is less common. In contrast to motor tics described above, vocal tics are repeated sounds or words that occur without intention. Tics are more common in children than adults, and boys are more commonly affected than girls. Tics can be suppressed if a person concentrates on suppressing them, but this becomes increasingly difficult with time. Tics are a characteristic symptom of Tourette syndrome and tic disorders, but they may also occur due to other medical conditions.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.
Pictures, Images, Illustrations & Quizzes
Addicted to Pills: The Health Risks of Drug Abuse
What is drug abuse? Learn about prescription drug abuse and over-the-counter (OTC) drugs, including depressants, pain relievers,...
Anxiety Disorder Pictures: Symptoms, Panic Attacks, and More with Pictures
Learn about generalized anxiety disorder (GAD). See if your worries are normal or something more by learning about symptoms,...
Epilepsy & Seizures Quiz: What Causes Seizures?
Do you know the difference between seizures and epilepsy? What are the types of seizures? Take the Epilepsy & Seizures Quiz to...
Epilepsy: Symptoms, Causes and Treatment
Learn about epilepsy stages, symptoms and treatment for this disorder of the brain's electrical system. Epileptic seizures cause...
Prescription Drug Abuse: Know The Warning Signs
Learn about prescription drug abuse facts and statistics about the dangers and misconceptions of abusing common prescription...
Stroke Causes, Symptoms, and Recovery
What is a stroke? Learn about stroke symptoms like sudden numbness or weakness, confusion, vision problems, or problems with...
Stroke Quiz: Test Your Medical IQ
Take the Stroke Quiz to learn about stroke risks, causes, treatment, and most importantly, prevention....
Teen Drug Abuse: Warning Signs, Statistics, and Facts
Teen drug abuse is a growing concern today. Learn statistics, facts, warning signs, and effects related to teen substance abuse...
Causes of Tic
Anxiety is a feeling of apprehension and fear characterized by symptoms such as trouble concentrating, headaches, sleep problems,...
Attention Deficit Hyperactivity Disorder (ADHD) in Teens
Attention deficit hyperactivity disorder (ADHD) in teens is a disruption of neurocognitive functioning. Genetics contribute to...
Childhood ADD or ADHD (Attention Deficit Hyperactivity Disorder in Children)
Attention deficit hyperactivity disorder (ADHD) causes the following symptoms in children: excessive activity, problems...
Drug addiction is a chronic disease that causes drug-seeking behavior and drug use despite negative consequences to the user and...
Dystonia disorders cause involuntary movements and prolonged muscle contraction, resulting in twisting body motions, tremor, and...
Huntington's disease is the result of degeneration of neurons in areas of the brain. Huntington's disease is an inherited...
PANDAS (Pediatric Autoimmune Neuropsychiatric Disorders Associated With Streptococcal Infections)
PANDAS is in part caused by an autoimmune response to a strep infection. Symptoms mimic those of OCD, ADHD, and include motor and...
Epilepsy is a brain disorder in which the person has seizures. There are two kinds of seizures, focal and generalized. There are...
Stroke (Signs, Symptoms, Warning Signs)
A stroke is an interruption of the blood supply to part of the brain caused by either a blood clot (ischemic) or bleeding...
Teen Drug Abuse
Drugs commonly abused by teens include tobacco products, marijuana, cold medications, inhalants, depressants, stimulants,...
Tourette syndrome is disorder, which symptoms include involuntary facial tics, motor tics, and vocal tics. The cause of Tourette...
Transient Ischemic Attack (TIA, Mini-Stroke)
When a portion of the brain loses blood supply, through a blood clot or embolus, a transient ischemic attack (TIA, mini-stroke)...
Other Causes of Tic
Examples of Medications for Tic
Subscribe to MedicineNet's General Health Newsletter