When an Adolescent’s Psychiatric Symptoms May Have a Medical Cause
A teenager begins sleeping through alarms, stops finishing assignments, withdraws from friends, and seems irritable nearly all the time. Depression is one possibility. So are anxiety, ADHD, substance use, chronic sleep deprivation, or a reaction to something happening at home or school.
Could a medical problem be producing, worsening, or disguising itself as a psychiatric one?
Fatigue, poor concentration, restlessness, disrupted sleep, appetite changes, declining school performance, and social withdrawal are not specific to one diagnosis. They can arise from psychiatric illness, medical illness, medication effects, nutritional problems, substance use, or several of these at once.
Most adolescent psychiatric symptoms are not caused by an unsuspected physical disease.
The goal is not to send every teenager through an exhaustive medical workup. It is to recognize when the history and examination point toward something that should be investigated before a symptom is treated in isolation.
The Body and Mind Do Not Arrive Separately
Adolescents do not always have the language to describe what has changed.
A teenager may say, “I can’t focus,” when the central problem is that they are sleeping five hours a night. “I feel anxious” may refer to an anxiety disorder, but it may also describe palpitations, shakiness, dizziness, or the effects of excessive caffeine. “I’m exhausted” may be part of depression, but it can also accompany anemia, restrictive eating, chronic pain, thyroid disease, or an unrecognized sleep disorder.
The reverse is also true. A teenager with a chronic medical illness may develop depression or anxiety in response to pain, uncertainty, missed school, treatment demands, or feeling different from peers. Those psychiatric symptoms are real even though they occur alongside a physical illness.
This is why a thorough psychiatric assessment includes more than a symptom checklist. It should consider medical problems, medications and supplements, sleep, eating, growth, recent injuries, substance use, family history, and physical symptoms that may not initially seem psychiatric.
The Pattern Often Matters More Than the Symptom
Poor concentration alone tells us relatively little. The pattern around it may tell us much more.
Did the change develop gradually over a school year, or did it appear over several days? Did it follow an infection, a sports injury, a medication change, rapid weight loss, or weeks of staying up until two in the morning? Is the teenager tired all day but unable to sleep at night? Are there headaches, dizziness, fainting, pain, snoring, menstrual changes, or an unexpected change in weight?
Has the teenager begun using cannabis, nicotine, energy drinks, workout supplements, weight-loss products, or medication prescribed to somebody else?
Parents will not always know the answers. The purpose is not interrogation. It is reconstruction: what changed, when it changed, and what else was happening at the time.
Sleep Problems Can Look Like Depression, Anxiety, or ADHD
Sleep is one of the first areas worth examining because inadequate or disrupted sleep can affect attention, memory, motivation, emotional regulation, and impulse control, producing symptoms that are easily mistaken for ADHD or anxiety
A chronically sleep-deprived teenager may look inattentive, depressed, volatile, or unmotivated. A teen who snores loudly, gasps during sleep, wakes with headaches, or remains exhausted despite spending enough time in bed may need evaluation for a sleep disorder rather than another discussion about bedtime discipline.
Adolescent biology naturally shifts sleep later, while school schedules continue to require early waking. The result can be chronic sleep restriction even in families making a serious effort to establish reasonable routines.
Sleep problems may also result from anxiety, depression, mania, trauma, substance use, or medication. That is why asking only, “How many hours do you sleep?” is rarely enough.
A useful sleep history includes:
Usual bedtime and wake time on school days
Weekend and “catch-up” sleep
How long it takes to fall asleep
Nighttime awakenings
Snoring, gasping, sleepwalking, or unusual movements
Napping
Evening screen use
Caffeine, nicotine, cannabis, and stimulant use
Whether the teenager feels restored in the morning
Can Thyroid Problems, Anemia, or Other Conditions Look Psychiatric?
Several relatively common medical conditions can contribute to symptoms that families experience as psychiatric.
Thyroid disorders can affect energy, concentration, sleep, and mood. Anemia or iron deficiency can contribute to fatigue, headaches, reduced exercise tolerance, and difficulty concentrating. Nutritional deficiencies may emerge in adolescents with restrictive diets, gastrointestinal illness, food insecurity, or eating disorders.
Diabetes and other conditions involving blood sugar or hormones may first become noticeable through thirst, fatigue, irritability, weight change, or declining functioning. Chronic pain, migraine, autoimmune illness, and symptoms that persist after an infection can also interfere with sleep, school attendance, activity, and emotional stability.
None of these conditions can be diagnosed from mood or concentration symptoms alone. Nor does every tired or distracted teenager require extensive laboratory testing. The history, physical symptoms, growth pattern, diet, menstrual history, medication exposure, and family history should determine what needs to be examined.
A psychiatric clinician may recommend coordination with the adolescent’s pediatrician, a physical examination, or selected testing when the presentation warrants it.
Ordering every possible test is not thoroughness. Neither is assuming that every physical complaint is simply anxiety.
Eating Disorders Do Not Always Look Obvious
A teenager can be medically compromised by restrictive eating, purging, compulsive exercise, or rapid weight loss without appearing markedly underweight.
Some adolescents conceal the behavior. Others do not recognize it as dangerous. Warning signs may include rigid food rules, avoiding meals with family, a sudden interest in “clean eating,” dizziness, fainting, feeling unusually cold, gastrointestinal complaints, menstrual disruption, slowed thinking, irritability, or withdrawal.
Changes in the adolescent’s growth pattern may be more informative than appearance alone.
Malnutrition can intensify anxiety, rigid thinking, irritability, depression, and difficulty concentrating. In that situation, changing a psychiatric medication without addressing the nutritional and medical problem would miss the center of the illness.
Medications, Substances, and Supplements Count as Medical History
Parents are commonly asked about prescription medication but not always about everything else an adolescent takes.
A complete review should include:
Prescription medications for psychiatric and medical conditions
Over-the-counter medications, including decongestants and antihistamines
Corticosteroids and hormonal medications
Energy drinks and concentrated caffeine products
Nicotine, cannabis, alcohol, and other substances
Pre-workout, bodybuilding, weight-loss, and sleep supplements
Nonprescribed or borrowed medications, including stimulants
These products can affect sleep, appetite, heart rate, blood pressure, anxiety, mood, and concentration. A medication prescribed appropriately for a medical condition may still have emotional or behavioral effects in a susceptible teenager.
The same attention should continue after psychiatric medication begins.
Appetite, weight, sleep, energy, pulse, blood pressure, agitation, restlessness, mood shifts, and new physical complaints can provide important information about tolerability.
Antidepressant treatment requires particular attention to worsening mood, suicidal thinking, agitation, irritability, unusual behavioral changes, or emerging symptoms of mania, especially early in treatment and after a dose change. A family history of bipolar disorder may affect how treatment is selected and monitored.
Monitoring is not an expression of fear about medication. It is part of using medication well.
When Psychiatric Symptoms Look Truly Unusual
Most adolescent depression, anxiety, and attention problems do not signal a rare neurologic or inflammatory illness. The threshold for medical evaluation changes, however, when symptoms appear suddenly or are accompanied by major changes in awareness, movement, or thinking.
Psychosis—a loss of reliable contact with reality that may include hallucinations, fixed false beliefs, or severely disorganized thinking—may require evaluation for neurologic, infectious, toxic, metabolic, or autoimmune causes when it begins abruptly. [1,2]
Concern rises when psychosis occurs with seizures, fever, unusual movements, severe confusion, rapid cognitive decline, or catatonia, a condition in which movement, speech, and responsiveness become markedly reduced or abnormal.[2,3]
Autoimmune encephalitis, a rare condition in which the immune system attacks the brain, can sometimes begin with psychiatric symptoms. It should not be assumed because a teenager has anxiety, obsessive symptoms, or a sudden behavioral change. The combination of psychiatric and neurologic symptoms is what makes the presentation unusual.
Consider the difference between two situations. A teenager who becomes anxious and withdrawn over several months needs a careful assessment, but that pattern alone does not suggest a rare brain disorder. Concern changes when a previously healthy teenager deteriorates over several days, becomes confused, begins hearing voices or making unusual movements, and then has a seizure.
Parents may also encounter the term PANS, or pediatric acute-onset neuropsychiatric syndrome, when researching the sudden onset of severe obsessive symptoms or food restriction. The term is often used loosely online. Abrupt behavior alone is not enough to establish the diagnosis; the full pattern, neurologic findings, course, and alternative explanations must be considered.[3]
Rare illnesses are rare. The point is simply that a truly unusual presentation should be recognized as unusual.
Head Injuries, Headaches, and Sudden Attention Changes
After a concussion, an adolescent may have trouble concentrating, feel slowed down, sleep too much or too little, become irritable, or seem anxious or depressed.
These changes may appear immediately or become more evident when the teenager returns to school, sports, driving, reading, or prolonged screen use. Headaches, dizziness, light sensitivity, nausea, memory difficulty, and reduced tolerance for mental effort may accompany the behavioral changes.
A history of a collision, fall, sports injury, or blow to the head can therefore change the interpretation of a new “attention problem.”
Sudden confusion, a seizure, loss of consciousness, weakness, an abnormal movement, a severe or worsening headache, or an abrupt personality change accompanied by neurologic symptoms requires prompt medical assessment.
What Parents Can Bring to the First Evaluation
Parents can make the initial evaluation more useful by bringing:
A complete list of medications, vitamins, supplements, energy drinks, and pre-workout products
Recent laboratory results and growth records, when available
School evaluations, report cards, or teacher observations
Records from prior psychiatric or psychological treatment
A rough two-week record of sleep and wake times
Information about recent illnesses, concussions, medication changes, weight changes, menstrual changes, or new physical symptoms
A simple timeline of when the problem began
Parents do not need to assemble a perfect medical dossier. A clear timeline is often more useful than a large stack of unsorted records.
What Medical Monitoring Do Psychiatric Medications Require?
Routine laboratory testing is not necessary before starting most psychiatric medications. Targeted baseline assessment and monitoring are important when a medication has known medical risks.[4]
Stimulants: growth, appetite, sleep, pulse, and blood pressure
Second-generation antipsychotics: weight, blood pressure, blood sugar, and cholesterol
Lithium: blood levels, kidney function, and thyroid function
Valproate: liver function, blood counts, and reproductive risks
A personal or family cardiac history, pregnancy risk, or another medical condition may change what additional assessment is needed.
The purpose is not to turn treatment into a medical ordeal. It is to know what should be checked, what should be followed, and which symptoms should prompt reassessment.
Parents should understand the monitoring plan before treatment begins.
When Symptoms Require Urgent Assessment
Families should seek urgent or emergency evaluation when an adolescent cannot remain safe or develops signs of acute medical or psychiatric instability.[6]
These include:
Suicidal intent, a suicide plan, or an inability to remain safe
Severe confusion or markedly reduced awareness
A new seizure or loss of consciousness
New psychosis accompanied by fever, unusual movements, catatonia, or rapid cognitive decline
New weakness, numbness, or difficulty speaking
A severe or worsening headache after a head injury
Fainting, severe dehydration, or signs of medical instability related to an eating disorder
Extreme agitation, sleeplessness, or behavioral change soon after a medication or substance exposure
When safety is uncertain, it is better to obtain immediate assessment than to wait for a routine appointment.
Even when a presentation is medically or psychiatrically complex, adolescents often improve substantially once the contributing problems are identified and care is coordinated.
What a Thorough Evaluation Should Accomplish
A thoughtful adolescent psychiatric evaluation does not begin with a predetermined laboratory panel, and it should not end with a prescription.
It should establish the symptom pattern, the settings in which difficulties occur, and the degree of impairment. It should include information from both the adolescent and the parent.
A portion of the visit should usually occur privately with the adolescent. This is not meant to exclude the family. It gives the teenager a better chance of speaking honestly about substance use, sexual health, eating, safety, trauma, relationships, and symptoms that may be difficult to discuss in front of a parent. The limits of confidentiality should also be explained clearly.
The evaluation should consider sleep, eating, growth, exercise, substance use, medications, supplements, medical history, family history, recent injuries, and relevant physical symptoms. School observations, prior records, and communication with the pediatrician may be important.
Some adolescents need no testing. Others may need a physical examination, laboratory studies, cardiac assessment, sleep evaluation, neurologic consultation, or coordinated care for a chronic illness.
Medical evaluation should not become a reason to postpone needed psychiatric treatment. A teenager can have depression and iron deficiency, anxiety and a sleep disorder, ADHD and substance use, or a chronic medical illness that has contributed to a genuine psychiatric condition.
Good care is often additive rather than either-or.
A medication evaluation should therefore do more than match a diagnosis to a prescription. It should clarify what has changed, consider medical and developmental contributors, identify what requires further evaluation, and define how treatment will be monitored.
This is the standard we use in Rappore’s adolescent evaluations.
Parents should leave understanding not only what the clinician thinks, but what else was considered, what remains uncertain, what should be evaluated elsewhere, and what changes will be watched over time.
That is not extra care. It is the work itself.
If your teenager’s mood, attention, sleep, or behavior has changed and you want an evaluation that looks at the whole picture, Rappore’s child and adolescent psychiatrists can help.
References
Hua LL. Collaborative Care in the Identification and Management of Psychosis in Adolescents and Young Adults. Pediatrics. 2021;147(6):e2021051486. doi:10.1542/peds.2021-051486.
Lavan O, Ganelin-Cohen E, Goldstein A, et al. Medical Evaluation of First Presentation of Psychotic Symptoms in Children and Adolescents. Frontiers in Psychiatry. 2026;17:1678974. doi:10.3389/fpsyt.2026.1678974.
Pediatric Acute-Onset Neuropsychiatric Syndrome: Clinical Report. Pediatrics. 2025;155(3):e2024070334. doi:10.1542/peds.2024-070334.
Walkup J. Practice Parameter on the Use of Psychotropic Medication in Children and Adolescents. Journal of the American Academy of Child and Adolescent Psychiatry. 2009;48(9):961–973. doi:10.1097/CHI.0b013e3181ae0a08.
Miller L, Campo JV. Depression in Adolescents. New England Journal of Medicine. 2021;385(5):445–449. doi:10.1056/NEJMra2033475.
Saidinejad M, Duffy S, Wallin D, et al. The Management of Children and Youth With Pediatric Mental and Behavioral Health Emergencies. Pediatrics. 2023;152(3):e2023063256. doi:10.1542/peds.2023-063256.
Authorship
Erica Gettenberg, MD — Board-Certified in Adult, Child, and Adolescent Psychiatry; expertise in mood and anxiety disorders and ADHD. LinkedIn: Erica Gettenberg, MD
All vignettes are fictional and for educational purposes only. This is not a substitute for professional medical advice.
