Why Can’t I Focus?

Written by Sharon Liao
Medically Reviewed by Poonam Sachdev on August 18, 2025
5 min read

Each time you sit down to work, your mind wanders or you start scrolling through your phone. Sound familiar? Most people have trouble focusing from time to time. But if it happens often, you may wonder why you can’t stay on task.

Lots of things, such as everyday habits, can affect your ability to focus. In some cases, a health issue may be the cause. Here’s what you need to know.

A short attention span may signal one of the following health issues:

ADHD. It isn’t just a kid thing. In adults, the main symptoms of this mental health condition can include:

  • Trouble focusing
  • Impulsiveness
  • Mood swings
  • Poor time management

Anxiety. Worrying takes brainpower, which can get in the way of focusing. Signs of a generalized anxiety disorder can include:

  • Constant anxiety
  • Fear
  • Inability to make decisions

Depression. This mood disorder is more than just feeling sad. It also affects the parts of your brain in charge of:

  • Attention
  • Memory
  • Decision making

Medication. Certain drugs can change the way brain chemicals work. They may mess with your memory and focus. These include drugs for:

  • Sleep
  • Allergies
  • Incontinence (when you can’t control your bladder)
  • Depression
  • Muscle spasms

Thyroid problems. The hormones this gland makes are important to several body functions, including thinking. If your thyroid gland doesn’t make enough or too much, you may have trouble concentrating.

Your attention span is how long you can focus on something or spend on a task before you need a break or get distracted. While everyone gets distracted from time to time, those with a short attention span often have trouble focusing on tasks and conversations.

Signs of a short attention span

The main sign of a short attention span is trouble focusing on tasks. This can be frustrating since it may seem to others that you don’t care about the task. But having trouble focusing or having a mind that wanders is not the same as being defiant or not caring.

Signs of a short attention span also include:

  • Making careless mistakes
  • Trouble reading long texts
  • Seeming not to listen
  • Leaving tasks unfinished
  • Trouble managing time or keeping things organized 
  • Forgetting activities or appointments

Other things that can affect your attention span include:

Stress. Experts think the part of your brain in charge of survival takes over when you’re stressed out. The other parts of your brain, such as those that control attention and thinking, don’t get as much energy.

Hunger. Your brain needs fuel to work. When your blood sugar dips, it’s harder to focus.

Multitasking. Working on a report while answering emails and listening to a conference call might seem like a timesaver. But juggling too much at once can backfire. Our brains are wired to handle one thing at a time. Research shows that constantly switching gears makes you less efficient and more likely to make mistakes.

Lack of sleep. It’s tough to pay attention when you’re tired. That’s because your brain cells recharge and recover when you’re asleep. They don’t work as well when you don’t get enough rest. Research shows that skipping even one night of sleep makes it harder to focus and block out distractions.

Eating lots of sugary or fatty foods. Sugar causes a quick rise in blood sugar, followed by an energy crash. Meanwhile, foods high in unhealthy saturated fat may trigger inflammation that affects your brain. One study found that women did worse on a test of their attention after eating a meal high in unsaturated fat.

Talk to your doctor if your inability to focus is affecting your life. For example, you may notice that you’re falling behind in school or at work.

You should also make an appointment if you have any of these symptoms:

  • Ongoing feelings of sadness, hopelessness, or guilt
  • Changes in your sleep habits, such as not being able to sleep or sleeping too much
  • Worry or anxiety that’s lasted for months or affects your daily life
  • Feeling tired for no reason
  • Dry skin, constipation, a puffy face, and/or a hoarse voice
  • Unintentional weight loss, insomnia, and heat intolerance

Make these changes to boost your concentration:

Time block. Have a lot on your plate? Set specific time slots for each task, such as half an hour each morning and afternoon to check email or answer calls. This keeps you from switching back and forth between duties.

Exercise regularly. It can help you blow off steam, sleep better, and ease stress. It also lowers inflammation and boosts the growth of new brain cells. That may sharpen your thinking in the long run.

Eat well. Eat foods high in fiber, unsaturated fat, and lean protein to stave off hunger and keep your blood sugar level steady. Fill your plate with different fruits and vegetables. They serve up nutrients your brain needs to function, such as vitamins B, C, E, and magnesium.

Cut down on distractions. Try to find a quiet area when you need to focus. Remove things that often compete for your attention. You may want to turn off the television or radio and switch off your phone notifications for some time.

Most people have trouble focusing sometimes. But if it happens often, you may wonder why you can’t stay on task.

Lots of things can affect your ability to concentrate, including ADHD, certain medications, and thyroid issues. So can stress, hunger, and lack of sleep. 

Treating any underlying health conditions may help. Blocking time for specific tasks, regular exercise, and getting rid of distractions (such as a blaring TV) are some ways to improve your ability to focus.

What is the condition called when someone gets distracted easily?

ADHD. People with ADHD have a harder time controlling their attention or directing it to certain tasks.