Health Conditions A-Z Mental Illness ADHD Signs and Symptoms of ADHD By Tahirah Chichester, MPH Tahirah Chichester, MPH Tahirah is a public health professional with more than 10 years experience supporting people along various stages of their health journey. She has a Master of Public Health in epidemiology and biostatistics from Temple University. health's editorial guidelines Published on February 27, 2023 Medically reviewed by Michael MacIntyre, MD Medically reviewed by Michael MacIntyre, MD Michael MacIntyre, MD, is a board-certified general and forensic psychiatrist practicing general psychiatry at the Veterans Affairs Healthcare System in Los Angeles. learn more Share this page on Facebook Share this page on Twitter Share this page on Pinterest Email this page In This Article View All In This Article Common Symptoms Symptoms of Predominantly Inattentive ADHD Symptoms of Predominantly Hyperactive-Impulsive ADHD Symptoms of Combined ADHD Symptoms in Adults Symptom Differences in Men and Women When to See a Healthcare Provider Edwin Tan / Getty Images ADHD is a disorder that can affect your thinking, behavior, and ability to function. There are three primary symptoms of ADHD: inattention (being distracted), hyperactivity (feeling restless), and impulsivity (making hasty decisions).Symptoms commonly appear during childhood, but can also linger into adulthood. Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder—or, a condition that affects proper brain growth and development. Generally, ADHD symptoms show up during childhood and can last into adulthood. But, these symptoms may change as a child gets older. Symptoms of ADHD fit into three major categories: inattention, hyperactivity, and impulsivity. Children with ADHD may experience symptoms in only one category. However, some people have symptoms in more than one category. ADHD symptom categories help lay the foundation for the three main types of ADHD. The type of ADHD you or your child has depends on their most dominant (strongest) symptom. These types include: Predominantly inattentive ADHDPredominantly hyperactive-impulsive ADHDCombined ADHD ADHD symptoms affect how a person thinks, behaves, and expresses their emotions. Because of this, ADHD can affect many areas of a person’s life, such as their performance in school or at work, how they navigate relationships, and their ability to carry out daily tasks. It’s normal for people to have moments of inattention, hyperactivity, and impulsivity from time to time. But in the case of ADHD, these symptoms last for more than six months. If you are concerned that you or your child might be displaying signs of ADHD, knowing the hallmark symptoms of the condition can encourage you to speak to a healthcare provider for testing and further support. Common Symptoms While there are three primary types of ADHD, all three types share some common symptoms. Generally, young children may show one or more of the following signs: Trouble listening to or following instructions Restlessness or fidgeting with their hands and feetTalking too muchDifficulty paying attention to detailsNot being able to finish projects, chores, or homework Symptoms of Predominantly Inattentive ADHD People with predominantly inattentive ADHD may often find it difficult to stay focused, have trouble following directions, and may appear to be daydreaming or off-task. It’s important to note that your or your child’s inattention is not an act of disobedience or a lack of understanding. Rather, the condition itself causes these symptoms to occur. In order to receive a diagnosis for inattentive-type ADHD, symptoms must last for at least six months. Common signs and symptoms of this type of ADHD include, but are not limited to: ForgetfulnessDisorganizationBeing easily distractedLosing or misplacing thingsPoor concentration or attention to detailNot be able to complete assignments and tasks Symptoms of inattention typically appear around the age of eight or nine years old. Children may have these symptoms at a younger age while at home. However, inattention may become more obvious while the child is at school given the environment—such as needing to pay attention in class and completing homework assignments. Many people with this type of ADHD usually experience these symptoms through their teenage years and early adulthood. Time Blindness: An ADHD Symptom That Can Harm Your Finances Symptoms of Predominantly Hyperactive-Impulsive ADHD In younger children, hyperactive and impulsive behaviors almost always occur together. Predominantly hyperactive-impulsive ADHD is characterized by having trouble sitting still, making hasty decisions, or performing behaviors without understanding the consequences of their actions. With hyperactive-impulsive type ADHD, you may also notice that you or your child are displaying one or more of the following symptoms: Excessive fidgeting while sitting downDifficulty taking turns with others Blurting things out in class Intruding or interrupting conversations or activitiesAnswering questions before they are fully askedFrequent restlessness Having a lot of energy Similarly to inattentive-type ADHD, symptoms must be present for at least six months before a healthcare provider can provide an accurate diagnosis. Hyperactivity and impulsivity typically appear around the age of four years old. Although impulsivity peaks around seven or eight years old, these symptoms may last throughout a person’s life. However, hyperactivity symptoms start to become less noticeable in adolescents. Symptoms of Combined ADHD People who receive a diagnosis for combined ADHD present symptoms of both inattentive ADHD and hyperactivity-impulsivity ADHD. Usually, people living with combined ADHD have an equal amount of symptoms from both types. Along with symptoms specific to both types of ADHD, people with combined ADHD may have trouble reaching their full potential at school or work and find difficulty in making friends or maintaining meaningful relationships. To receive an accurate diagnosis for combined ADHD, symptoms from both types of ADHD must be present for at least six months. What Is Rejection Sensitive Dysphoria? Symptoms in Adults Although symptoms first appear during childhood and adolescence, adults can also have ADHD as they transition from their teenage years into early and middle adulthood. Some studies also show that people can develop ADHD symptoms during adulthood, but more research is needed to understand why this happens. Adults experience the same three types of ADHD as children, but symptoms of each type can sometimes look different as you age. For example, adults with undiagnosed ADHD might have difficulty keeping a stable job because it’s hard for them to get up in the morning or go to work on time. People with hyperactivity symptoms may also try to complete several tasks at the same time, which can often end in unsuccessful results. Those with inattentive ADHD may forget to pay bills or lose important documents and objects. Similar to children and teenagers, ADHD symptoms can often interfere with relationships, work life, and personal well-being. These symptoms can also become more severe as you get older, which can happen because daily tasks and life’s demands in adulthood increase. Things To Try If You're an Adult With ADHD Symptom Differences in Men and Women ADHD is more commonly diagnosed in boys compared to girls. This occurs because research on ADHD has historically been studied on boys. Young boys tend to have symptoms of hyperactivity, while young girls display signs of inactivity. Currently, boys receive an ADHD diagnosis far more often than girls. Keep in mind: this does not mean that boys are more likely to have ADHD. Instead, more research is needed to understand how ADHD symptoms can present themselves differently in young girls and women. When to See a Healthcare Provider It’s normal to experience inattention, impulsivity, or hyperactivity from time to time. In the case of ADHD, these behaviors are often more severe, occur more frequently, and can have a negative effect on everyday tasks and yours or your child’s quality of life. ADHD is considered a chronic disorder. As with any other chronic condition, early diagnosis and treatment can help manage ADHD symptoms. If you’ve noticed that you or your child may be displaying symptoms of ADHD, it’s a good idea to make a visit to your primary healthcare provider or your child’s pediatrician. They can refer you to a psychologist or psychiatrist and help you figure out next steps for diagnosis and treatment. Was this page helpful? Thanks for your feedback! Tell us why! Other Submit 9 Sources Health.com uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Centers for Disease Control and Prevention. What is ADHD? Krull, KR. Patient education: Symptoms and diagnosis of attention deficit hyperactivity disorder in children (beyond the basics). In: Post TW. UpToDate. UpToDate; 2022. American Psychiatric Association. What is ADHD? National Institute of Neurological Disorders and Stroke. Attention deficit hyperactivity disorder. Krull, KR. Attention deficit hyperactivity disorder in children and adolescents: Clinical features and diagnosis. In: Post TW. UpToDate. UpToDate; 2022. Centers for Disease Control and Prevention. Symptoms and diagnosis of ADHD. Bukstein, O. Attention deficit hyperactivity disorder in adults: Epidemiology, pathogenesis, clinical features, course, assessment, and diagnosis. In: Post TW. UpToDate. UpToDate; 2022. National Institute of Mental Health. Attention-deficit/hyperactivity disorder in adults: What you need to know. National Institute of Mental Health. Attention-deficit/hyperactivity disorder.