Why Can't I Focus Anymore?
You sit down to work, and thirty minutes later you have read four things you did not intend to read and none of the one you did. The usual explanation is that your attention span has been destroyed. That is rarely the whole story, and it is the least actionable version of it.
Start with the boring causes
Before attributing anything to phones, rule out the two causes that explain most cases and respond to treatment. The first is sleep. A week of six-hour nights produces exactly the symptoms people describe as an attention problem: losing the thread mid-paragraph, rereading, irritability, and a strange difficulty starting things. The second is stress. A mind running a background process about money, a person or a deadline has less capacity left for the document in front of it.
Neither of these is a character flaw and neither is fixed by an app. If both are true for you, no focus technique will do much until they are addressed.
The interruption arithmetic
The most underrated cause is that returning to a task is expensive. Research on interrupted work has repeatedly found that getting back into a demanding piece of work takes minutes, not seconds. The cost is invisible because each interruption seems trivial.
Do the arithmetic. If a notification pulls you out four times an hour and each return costs a few minutes of reassembly, you have spent a large part of the hour reloading rather than working. You did not lose concentration. You never got a continuous stretch in which to have any.
Vagueness reads as difficulty
Watch what happens when you sit down to a task described in your own notes as "sort out the report". The mind bounces off it, because the first move is undefined, and an undefined first move feels like effort. Then something with a defined first move, the inbox, the feed, arrives and wins.
Almost every task that keeps getting avoided is under-specified. Rewriting it as a physical next action, open the file and write the three section headings, removes most of the resistance. This is why people can concentrate for hours on things with obvious next steps and not at all on things with none.
The phone question, stated fairly
Phones deserve a share of the blame, but not the mystical version. The mechanism is ordinary. A phone puts a reliable source of small rewards within reach at every moment of friction, and every difficult task is made of moments of friction. Over time you learn to reach for it at the first sign of resistance, before the difficulty has even registered.
The test is not how long you use it but how often you check it when nothing has happened. If your hand moves at every pause in a conversation, in a lift, at a red light, then the habit is running on its own and it will run during work too.
Low mood, and the difference that matters
Difficulty concentrating is one of the standard features of low mood and anxiety, which is worth stating plainly because people often treat it as a productivity failure and add guilt to the pile. The distinguishing question is whether the difficulty comes with flatness, loss of interest, or a persistent sense of dread. If it does, it is not a focus problem in the usual sense and it responds to different help.
How to tell which one is yours
Take three days and note, each time you lose the thread, what was true at that moment: how much you slept, whether something interrupted you, whether the next step was defined, whether you reached for the phone before or after the difficulty appeared. The pattern is normally obvious within a week, and it is usually not the one you assumed.
If the answer turns out to be the habit of reaching, the practical work is rebuilding the relationship with the device rather than deleting it, which is what Digital Detox works through in twelve chapters. If the answer is that the day never contains an uninterrupted stretch, the related piece is how to stop checking your phone, which deals with the reaching reflex itself.
Common questions
Why can I focus on some things but not work?
Attention follows interest and clarity. A task you find absorbing supplies its own motivation; a vague task does not, and the mind treats vagueness as a reason to leave. If you can watch a film for two hours but not write an email, the problem is usually the email's definition, not your attention span.
Has my attention span really got shorter?
The evidence for a permanently shrunken attention span is weaker than the headlines suggest. What is well established is that frequent interruption is costly, and that most people are now interrupted far more often than they were. That is a change in conditions rather than in capacity.
How long does it take to refocus after an interruption?
Longer than people expect. Research on interrupted work suggests it can take many minutes to return fully to a demanding task, and the more complex the task, the higher the cost. Four interruptions an hour can consume most of the hour.
Is poor concentration a sign of ADHD?
It can be, but poor concentration is a symptom of many ordinary things first: short sleep, high stress, low mood, and constant interruption. ADHD is a lifelong pattern across settings, not a recent decline. If the difficulty is longstanding and affects several areas of life, it is worth discussing with a doctor.