Yes, it is possible for the presentation of ADHD symptoms to change over time, from childhood to adulthood. In fact, it is quite common for individuals to experience a shift in the predominant symptoms as they mature.
ADHD has traditionally been classified into three subtypes:
Predominantly Inattentive Presentation (previously called ADD): Individuals with this subtype primarily struggle with inattentive symptoms, such as difficulty sustaining attention, being easily distracted, forgetfulness, and organizational problems.
Predominantly Hyperactive-Impulsive Presentation: This subtype is characterized by predominantly hyperactive and impulsive symptoms, such as restlessness, fidgeting, impulsivity, and difficulty waiting for one's turn.
Combined Presentation: This subtype involves a combination of inattentive, hyperactive, and impulsive symptoms.
As individuals with ADHD age, they may experience changes in their symptom presentation. While hyperactive and impulsive symptoms are often more noticeable in children, inattentive symptoms may become more prominent in adolescence and adulthood. Some people with ADHD may "outgrow" or learn to manage their hyperactive and impulsive symptoms better as they mature, but the core challenges with attention and executive function often persist.
The current understanding of ADHD recognizes that symptom presentations can evolve over time, and the diagnosis and treatment should be based on the individual's current symptomatology. If you were diagnosed with combined-type ADHD as a child but now primarily experience inattentive symptoms as an adult, this is entirely plausible and not uncommon.
If you are experiencing difficulties related to inattentive symptoms or have concerns about your ADHD diagnosis, it's essential to discuss your current symptoms and challenges with a qualified healthcare professional specializing in ADHD or adult mental health. They can provide you with a comprehensive evaluation and work with you to develop an appropriate treatment plan tailored to your specific needs.