How do ADHD symptoms differ by age and gender?

Many people notice changes in their ADHD symptoms as they age, while some challenges remain constant.^[1] 

Children

ADHD symptoms are often easier to spot in children. Here are some examples of how they might manifest:

• Struggling to follow simple directions, like “put your shoes on”
• Squirming, getting up, or chatting when they’re supposed to be quiet, like during storytime
• Doing things too quickly and making careless mistakes, like while pouring juice into a cup
• Taking things without asking, like a pen from a classmate’s desk
• Forgetting things their teacher just said, like instructions for an activity
• Getting upset or frustrated over small things, like dropping a toy or losing a game

Let’s imagine the following scenario to help you understand what ADHD might look like in a child:

During the morning meeting, the teacher asks the class to put their bags away, but one child gets distracted by a toy. During story time, the same kid keeps fidgeting and whispering.

At break, they take a biscuit without asking, and when they spill their juice, they become very upset and start crying.

Adolescents

In adolescence, ADHD may become less noticeable, or start to be expressed in different ways as it interacts with changing hormone levels and puberty.

Here are some ways that ADHD could affect teenagers:

• Putting off their homework, like leaving an essay until the last minute
• Rushing through classwork without really paying attention
• Handing in “messy” work with lots of careless mistakes
• Taking a long time to finish things and sometimes not getting them done on time
• Acting up in class to get everyone’s attention
• Getting fidgety or bored on trips if they’re not find them interesting
• Acting impulsively without thinking about what might happen next
• Struggling to follow instructions that have more than one step

Example: During science class, a teenager zones out and misses instructions for a group project. They feel too shy to ask for help and dive into the experiment without a plan, which leads to mistakes.

After school, they try to do homework but get distracted by their phone, a snack, and a random video. An hour flies by with very little done.

They feel frustrated because they want to focus, but their mind just won’t cooperate.

As a result, teenagers with ADHD can struggle at school, in their social lives, and when trying to become more independent.^[2]

But support makes a big difference. When they feel accepted by their peers, have good friendships, and are understood by those around them, they’re more likely to get actively involved at school and feel like they belong.^[2]

Adults

ADHD in adults can be harder to spot as you develop coping strategies and masking behaviours. Hyperactivity can become less common and symptoms can be internalised.

Here are some ways ADHD can manifest in adults:

• Struggling with organisation, time management, prioritising tasks
• Forgetting tasks or deadlines
• “Spacing out” while reading and having to go over the same bit again
• Going into “hyperfocus” when dealing with something interesting
• Difficulty maintaining a stable job
• Making risky financial choices or spending impulsively
• Procrastination
• Excessive talking, interrupting others, and having difficulty waiting turns
• Being impatient or “quick-tempered”
• Struggling with social challenges, like maintaining stable relationships

Here’s a glimpse into the morning of an adult with ADHD:

The morning starts in a panic—wake up, check the time, then try to fall back asleep, only to be startled by the alarm. After a few rounds with the snooze button, it's suddenly 11 a.m.—yoga class missed, no time to shower, and your clean clothes are still in the washer.

Getting ready for work: searching for something wearable, going through your usual morning routine (and realising you’re almost out of essentials), grabbing a snack on the way out the door… then running back in for your phone. Then again, for the keys.

Somehow, despite the chaos, there's still time to make the morning meeting. Just.

Bottom line: for adults with ADHD, challenges can show up in many areas of daily life.

At work, it might be hard to stay organised, meet deadlines, or follow through on tasks, which can affect job stability and confidence.

In relationships, things like impulsive comments, forgetfulness, or zoning out during conversations can lead to misunderstandings or tension with partners, friends, or family.

Daily routines, like paying bills on time, keeping appointments, or sticking to a plan, can feel overwhelming. Even small tasks sometimes take up a lot of mental energy.

And hyperactivity can look a little different in adults. It’s often internal, and may present itself as a constant feeling of restlessness, racing thoughts, or a sense of being “on edge”, even when sitting still.

Do symptoms differ by gender?

In the past, people believed ADHD mainly affected boys and men. But we now know that women can have it too, just not always in the same way, and usually at slightly lower rates.

But women tend to have more inattentive symptoms, like trouble focusing or staying organised, rather than the hyperactivity that’s more commonly seen in men.^[3] These signs can be easier to miss, which means women are often diagnosed later in life, or sometimes not at all.

Could ADHD symptoms be caused by something else?

In short, yes. Other conditions and factors can cause symptoms similar to those seen in ADHD, like:

• Stress and life changes: Big events like moving house, divorce, or a new baby can make you act out, get distracted, or become restless.
• Sleep issues: Not getting enough sleep affects focus, mood, and behaviour. Sleep problems like restless legs or sleep apnoea can make someone seem inattentive.
• Mental health and neurodevelopmental conditions like:
  • Anxiety and depression can cause restlessness, forgetfulness, and low motivation.
  • Bipolar disorder can involve impulsivity and racing thoughts.
  • OCD can make it hard to shift focus or pay attention due to obsessive thoughts or rituals.
  • Addiction affects memory, attention, and mood.
  • Autism may cause someone to be overexcited, hyperactive, and impulsive.
  • Tic disorders may resemble the fidgeting and motor movements seen in ADHD.
• Medical conditions like thyroid problems, seizures, or hearing/vision problems can also affect attention

ADHD can happen alongside other conditions, including:

• Anxiety
• Depression
• Learning disorders such as dyslexia
• Sleep disorders
• Addiction
• Rejection sensitive disorder (RSD), which involves intense emotional reactions to perceived rejection or criticism
• Bipolar disorder

Everyone’s situation is different, so it’s important to look at the full picture, not just one set of symptoms.

References:

1. Sibley, M.H., et al. (2021). Variable patterns of remission from ADHD in the multimodal treatment study of ADHD. American Journal of Psychiatry, 179(2), pp.142–151.
2. Kara, K., et al. (2025). School participation, supports and barriers of children with and without attention deficit hyperactivity disorder. BMJ Paediatrics Open, 9(1), pp.e002917–e002917. https://doi.org/10.1136/bmjpo-2024-002917
3. The National Health Service (NHS). (2025). ADHD in adults. https://www.nhs.uk/conditions/adhd-adults/