noun, noun which may take the genitive case particle 'no'
hyperactivity; excessive activity
Refers to a state of being overly active, often used in medical, psychological, or everyday contexts to describe abnormally high levels of activity.
Worried about my child's hyperactivity, I consulted a doctor.
An overly active lifestyle can cause stress.
多動 is often used in clinical terms like ADHD (注意欠如・多動症), while 活動過多 is a broader term for excessive activity in general.
Compound of 活動 (activity) and 過多 (excess). The exact historical derivation is uncertain, but the meaning is transparent from its components.