Why Adults With ADHD Feel Mentally Exhausted by Everyday Tasks
By Dr. Karanvir Singh
By late afternoon, the office is quiet, but his mind is crowded. He has answered emails, attended meetings and solved problems all day. Yet the simple tasks he promised to finish remain untouched.
At 6:20, Daniel closes his laptop and notices the reminder he has snoozed four times. He opens the form, reads the first question, then remembers the call. He searches for the number, sees an unread message and starts replying. Ten minutes later, the form is still open. He checks tomorrow’s calendar, remembers a document he has not attached and returns to the form. At home, his partner asks whether he has sent it. “I have been working since nine,” he says, sounding defensive even to himself. “I know,” she replies, “but it was a simple thing.” He cannot explain why that sentence stings. He is not short of intention. He is exhausted by the effort of repeatedly finding his place, deciding what comes next and pulling his attention back. Even small unfinished tasks seem to follow him into the evening.
For some adults with ADHD, this gap between intention and completion can involve executive functioning: mental processes that help us hold information in mind, prioritise, begin tasks and move between them. When these processes are less reliable, an ordinary day may demand repeated acts of self direction. That can be tiring. It is one possible explanation, not a diagnosis of Daniel or anyone who recognises the story.
Research supports taking fatigue seriously. In a 2017 study in the British Journal of Clinical Psychology, Denise C. Rogers and colleagues compared self reported fatigue in 243 adults with ADHD, 86 adults with chronic fatigue syndrome and 211 healthy controls. The ADHD group reported significantly more fatigue than controls; 62% met the study’s threshold for fatigue caseness. As a cross sectional outpatient study, it cannot establish why fatigue occurs or how common it is among all adults with ADHD.
The overlooked cost may be the invisible work between tasks: remembering what was intended, resisting distractions, restarting after interruption and managing the frustration of falling behind. Instead of asking, “Why can I not just do this?”, a more useful question may be, “Which part of getting this done is taking the most effort?” Naming that step can turn a vague sense of failure into something specific that can be understood and supported.
Adult ADHD counselling can help explore patterns in attention, task initiation and daily functioning, while distinguishing ADHD related difficulties from factors such as sleep problems, anxiety or low mood. The aim is not to demand more willpower, but to understand what is making everyday life harder and identify support that fits the person.
The character and situation described in this article are fictional and do not represent an actual client.
My name is Dr. Karanvir Singh. I am a psychotherapist, organizational psychologist, and researcher with over twelve years of experience supporting people through pain, uncertainty, transformation, and renewal. My work is not simply about symptoms or diagnoses; it is about people and the complexity of what it means to live, connect, and try to make sense of ourselves in an often unkind world.