Can ADHD show up mostly as forgetfulness and not hyperactivity?

Yes. Inattentive type ADHD often presents primarily as forgetfulness, distraction, losing track of conversations, and difficulty organizing thoughts. Physical restlessness may be minimal or absent, especially in adults. These individuals are often described as daydreamy, scattered, or mentally elsewhere rather than hyper. Because hyperactivity is what people associate most with ADHD, inattentive presentations are frequently missed. Forgetfulness that’s persistent, effort resistant, and present across settings is a key feature clinicians look for.