What is the difference between ADD and ADHD?

Short answer

ADD is an older name. CHADD explains that since 1994, every form of the condition has officially been called ADHD, whether or not hyperactivity is present. Many people still say ADD to mean what clinicians now call the predominantly inattentive presentation. So someone described as having ADD today would usually be diagnosed with ADHD, inattentive presentation.

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If you grew up hearing about ADD, or someone in your family was diagnosed with it, the switch to ADHD can be confusing. It sounds as though hyperactivity has been added to the picture. In fact, the change was about naming, not about adding symptoms.

A short history of the names

The three presentations today

ADHD presentations as described by CHADD
Presentation	Main features
Predominantly inattentive	Trouble sustaining attention, following through, organizing, and staying on task; easily distracted and forgetful
Predominantly hyperactive-impulsive	Fidgeting, difficulty staying seated, talking a lot, interrupting, trouble waiting
Combined	Meets the criteria for both of the above

What people used to call ADD usually lines up with the first row. The word presentation is used because symptoms can shift over time.

Why the old name sticks

ADD is short, familiar, and feels like a better fit to people who were never hyperactive. For example, a quiet adult who daydreamed through school may feel that hyperactivity simply does not describe them. That reaction is understandable. The official name covers them anyway.

The inattentive picture is easy to miss

Does it matter which word you use?

In everyday conversation, not really. Use whichever word feels natural. At an appointment, describe what you experience in your own words, and expect the clinician to use the current terms in any notes or report. If you were diagnosed with ADD years ago, mention that and bring any old records you have.

Presentation is not the same as severity

If you were diagnosed with ADD long ago

If you were told you had ADD as a child, nothing about that diagnosis became invalid when the name changed. Today you would simply describe it as ADHD, most likely the inattentive presentation. If you want support as an adult, an adult clinician will look at how you function now, since presentations and severity can change over time.

Common mix-ups

Thinking ADD and ADHD are two separate conditions. They are one condition with an older and a newer name.
Assuming ADHD always means visible hyperactivity. The inattentive presentation involves little or none.
Treating presentation as a fixed type. A person can fit a different presentation at a different age.
Reading the presentation as a measure of how much ADHD affects someone. Severity is rated separately.

Clearing up these mix-ups can make conversations with family and coworkers easier, especially if they remember the older term.

A starting point for your next step.

The free screener includes experiences from both the inattentive and the hyperactive-impulsive side, so it suits any presentation as a first look.

Frequently asked questions

Is ADD still a diagnosis?

Not officially. CHADD explains that since 1994 every form is called ADHD. The mostly inattentive form that many people still call ADD is now the predominantly inattentive presentation.

Is inattentive ADHD milder?

Not necessarily. The presentation describes which symptoms stand out, while severity is rated separately as mild, moderate, or severe, according to CHADD.

I was diagnosed with ADD as a child. Is that the same thing?

In most cases, yes. It is the same condition under an older name. If you want support now, an adult clinician can look at how it affects you today.

Sources

Source check: 2026-10-28. No medical review has occurred.

Published 2026-10-28. Factual source check: ADHDFalcon editorial team, factual source check, 2026-10-28. No medical review has occurred.