What If It's Not ADHD? Other Causes of Poor Focus

If an ADHD evaluation points somewhere else, it isn't a dead end. Trouble focusing can come from sleep problems such as sleep apnea, anxiety, depression, a thyroid problem, alcohol or drug use, or a medication's side effects. Your provider explains what seems likely and may recommend a next step, such as blood work, a sleep evaluation or a referral.

At Padgett Medical Center in Tampa, new patients who book online with a card on file pay $169 for the ADHD evaluation, 35% off the regular $260. Nothing is charged when you book, and no diagnosis or prescription is promised in advance. See adult ADHD care and pricing.

Why does an ADHD evaluation look for other causes?

An ADHD evaluation looks for other causes because trouble paying attention is one of the most common symptoms there is, and ADHD is only one explanation. A 2025 review in World Psychiatry points out that difficulties with attention are among the most common symptoms listed in the DSM-5-TR, the manual clinicians use to diagnose mental health conditions.

The American Psychiatric Association lists conditions that can mimic ADHD, including learning disorders, mood disorders, anxiety, substance use, head injuries, thyroid conditions and some medications such as steroids. The CDC says a medical and psychological exam may be needed to rule out other health problems that cause symptoms like ADHD or often occur with it. This isn't a formality. Treating ADHD when sleep apnea is the real problem would leave the real problem in place.

Could a sleep problem be causing it?

Yes, and it is one of the first things to check. The World Psychiatry review notes that sleep disorders such as insomnia or obstructive sleep apnea can cause inattentive and hyperactive symptoms during the day, and it calls a good assessment of sleep mandatory.

Sleep apnea is a disorder in which breathing stops and starts during sleep. The National Heart, Lung, and Blood Institute lists loud snoring, gasping for air and breathing that starts and stops, along with daytime sleepiness that can lead to problems with learning, focusing and reacting. Fatigue, headaches and insomnia are more common signs in women. You may not know about the nighttime signs until someone tells you, so ask a partner or roommate. If sleep apnea is suspected, NHLBI notes you may need a sleep study to diagnose it. For how ADHD and sleep affect each other, see ADHD and sleep.

How can anxiety or depression look like ADHD?

Anxiety and depression can both make it hard to concentrate. The National Institute of Mental Health lists difficulty concentrating, remembering or making decisions among the symptoms of depression, along with fatigue, restlessness and sleep changes.

Timing is one of the most useful clues. The World Psychiatry review notes that attention problems that began before any mood symptoms support ADHD, while attention that slips only because worry or rumination keeps pulling at it, as in generalized anxiety disorder, points toward anxiety. So expect questions about when your focus problems started and whether they were there in childhood, long before the stress of the past year. ADHD or anxiety? covers that overlap in detail.

If low mood comes with thoughts of harming yourself, don't wait for an appointment. NIMH advises calling or texting the 988 Suicide and Crisis Lifeline at 988, or chatting at 988lifeline.org. In a life-threatening situation, call 911.

Can a thyroid problem cause ADHD-like symptoms?

It can. The APA lists thyroid conditions among those that can mimic ADHD. The National Institute of Diabetes and Digestive and Kidney Diseases lists nervousness, irritability, trouble sleeping and fatigue among the symptoms of an overactive thyroid, which can feel a lot like restlessness and scattered focus.

Symptoms alone can't settle it. NIDDK says hyperthyroidism can't be diagnosed from symptoms alone because many of them are shared with other conditions, and that a blood test might confirm it. It is more common in women and in people over 60. The World Psychiatry review likewise says physical and laboratory checks can help rule out conditions such as hyperthyroidism, and NIMH notes that thyroid disorders can cause the same symptoms as depression.

Can alcohol, cannabis or a medication cause these symptoms?

Yes. The World Psychiatry review lists substance intoxication and withdrawal among the conditions that must be ruled out, and gives the example of attention and planning problems after heavy cannabis use in someone with no earlier history of ADHD symptoms. It also says any medication that might cause inattention or hyperactivity should be ruled out.

That is why the evaluation asks about everything you take: prescriptions, over-the-counter products, supplements, caffeine, alcohol, cannabis and other substances. Honest answers protect you, because they change what is safe to recommend. Before any controlled medication is prescribed, Padgett also checks E-FORCSE, Florida's prescription drug monitoring program. If a medicine you take may be part of the problem, don't stop it on your own; talk with the prescriber who manages it.

What might the provider recommend if it isn't ADHD?

The provider may recommend a next step aimed at the likely cause. That could be blood work, such as thyroid tests, through your primary care provider; a sleep evaluation if sleep apnea or another sleep disorder seems likely; or a mental health professional for anxiety, depression or substance use.

The APA notes that an ADHD evaluation may include a referral for a medical evaluation to rule out other conditions. Sometimes the honest answer is that it isn't clear yet, and the provider needs more history, such as school records or input from someone who knew you as a child. Useful questions to ask: What do you think is going on? What should happen next, and who does it? What would make you look at ADHD again?

Can you have ADHD and another condition at the same time?

Yes. Finding another condition doesn't automatically rule ADHD out. The APA notes that ADHD can co-exist with other conditions, including anxiety disorders and learning disorders.

The World Psychiatry review says conditions such as generalized anxiety disorder, major depression and learning disorders must be ruled out as the only source of ADHD-like symptoms, and admits this can be hard and leave some uncertainty. Your provider decides what to address first. If another condition is treated and your focus problems stay the same, bring that back to your provider; it is useful information.

What does this mean for a visit at Padgett?

At Padgett Medical Center, the new patient ADHD visit is 30 minutes, always in person at 6904 W. Linebaugh Ave, Tampa, FL 33625, with Morgan Colee, PA. It covers your symptoms, how long they've been present, including childhood, how they affect work and home, your health history, current medications and any prior records.

Health history is where sleep, mood, thyroid, substances and medications come up, so come prepared. Bring a list of everything you take, any recent lab results and notes on your sleep, including snoring if someone has mentioned it. Whatever the provider finds, ask them to explain it and what comes next. There is no waitlist: book any open time online, or read what to expect at an adult ADHD evaluation first.

This article is educational and is not medical advice. Talk with a licensed provider about your own health, medications and treatment options.