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ADHD symptoms in adults and children: what ADHD is and how it shows up
Key takeaways
- ADHD stands for attention-deficit/hyperactivity disorder, a neurodevelopmental condition.
- There are three presentations: predominantly inattentive (once called ADD), hyperactive-impulsive, and combined.
- About 15.5 million US adults (6%) had a current ADHD diagnosis in 2023, and about half were diagnosed in adulthood.
- Stimulant medicines can raise heart rate and blood pressure — worth tracking.
What is ADHD?
ADHD is a brain-based condition that affects attention, activity level and impulse control. It starts in childhood, though many people are not diagnosed until adulthood. ADHD is not caused by bad parenting, sugar or laziness; genes play a large role.
The three types of ADHD
| Presentation | Main features |
|---|---|
| Predominantly inattentive ("ADD") | Trouble focusing, organizing and finishing tasks; forgetful; easily distracted |
| Predominantly hyperactive-impulsive | Fidgeting, restlessness, talking a lot, interrupting, acting without thinking |
| Combined | Both sets of symptoms |
Inattentive symptoms
- Careless mistakes; overlooks details
- Hard to stay focused on tasks, reading or conversations
- Seems not to listen when spoken to
- Doesn't finish tasks; gets sidetracked
- Struggles to organize tasks and manage time
- Avoids tasks that need sustained mental effort
- Loses keys, phone, paperwork
- Easily distracted; forgetful in daily activities
Hyperactive-impulsive symptoms
- Fidgets, taps, squirms
- Leaves seat when expected to stay seated
- Feels restless (in adults, often an inner restlessness)
- Talks excessively; blurts out answers
- Has trouble waiting their turn; interrupts others
For a diagnosis, symptoms must have been present before age 12, show up in two or more settings (such as home and work), last at least six months, and clearly interfere with life (DSM-5).
ADHD symptoms in adults
Adult ADHD often looks less like running around and more like: chronic lateness and "time blindness", procrastination, unfinished projects, trouble with paperwork and bills, restlessness, impulsive spending or speaking, strong emotional reactions, and feeling overwhelmed. Many adults also live with anxiety or depression.
ADHD in women and girls
Girls more often have the inattentive type, which is quieter and easier to miss. Many women are diagnosed only in adulthood, sometimes after their own child is diagnosed or when demands rise at work or after having children.
How ADHD is diagnosed
A clinician — such as a psychiatrist, psychologist or pediatrician — takes a history, uses rating scales, gathers information from others when possible, and rules out conditions with similar symptoms (sleep problems, thyroid disease, anxiety, depression). Screening questionnaires can be a first step: see our guide to the ADHD test and ASRS screener.
Treatment
- Medicines: stimulants (methylphenidate, amphetamines such as lisdexamfetamine) and non-stimulants (atomoxetine, guanfacine, clonidine, viloxazine).
- Therapy and coaching: CBT for adults, behavioral parent training for children, skills for organization and time management.
- Lifestyle: sleep, exercise and routines help focus.
ADHD medication and your heart
Stimulant medicines commonly raise resting heart rate by a few beats per minute and blood pressure by a few mmHg. For most healthy people that's not a problem, but doctors check pulse and blood pressure before starting and during treatment, and people with heart conditions need extra care. Report palpitations, chest pain or fainting right away.
Cardivo makes that monitoring easy: check heart rate and HRV with your fingertip on the iPhone camera in about 30 seconds, log cuff blood pressure, and take the in-app ASRS adult ADHD screener, plus PHQ-9 (mood) and GAD-7 (anxiety) check-ins — then share a PDF with your prescriber. Learn more in high resting heart rate and mood, stress and pulse.
This guide is general wellness education based on the public sources below. It is not medical advice, diagnosis, or treatment. Cardivo is not a medical device. If you think you are having a medical emergency, call 911.
Frequently asked questions
What does ADHD stand for?
ADHD stands for attention-deficit/hyperactivity disorder.
What are the main symptoms of ADHD?
Inattention (trouble focusing, organizing, finishing tasks, forgetfulness) and hyperactivity-impulsivity (fidgeting, restlessness, talking a lot, interrupting, acting without thinking).
What is the difference between ADD and ADHD?
ADD is an older name. Today it is called ADHD, predominantly inattentive presentation — ADHD without prominent hyperactivity.
Do ADHD medications affect heart rate?
Stimulant ADHD medicines usually raise resting heart rate and blood pressure slightly, so doctors monitor both during treatment.
Sources
- CDC — Symptoms of ADHD
- NIMH — Attention-deficit/hyperactivity disorder
- CDC MMWR — ADHD diagnosis and treatment in adults, United States, 2023
- NHS — Attention deficit hyperactivity disorder (ADHD)