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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Neuropsychology

Navigating TAND: Behavioral and Learning Challenges

At a Glance

TAND is common in tuberous sclerosis complex and can affect behavior, learning, attention, mood, sleep, and social skills. Annual screening with the TAND Checklist or TANDem helps identify concerns early so formal evaluations and tailored supports can begin.

While much of the medical focus in Tuberous Sclerosis Complex (TSC) is on physical tumors, the “hidden” side of the condition—affecting how a person thinks, feels, and learns—is often what impacts daily life the most. These challenges are collectively known as TSC-Associated Neuropsychiatric Disorders, or TAND [1].

TAND is not a single diagnosis but an “umbrella term” that covers a wide range of difficulties spanning the entire lifespan, from childhood into adulthood. It is incredibly common: between 77% and 88% of individuals with TSC will experience at least one TAND-related concern [2][3].

The Seven “Clusters” of TAND

Research has shown that TAND symptoms often group together into “natural clusters.” Understanding these can help you and your doctor identify specific areas where you or your child might need extra support [1][4]:

  1. Autism-like Cluster: Difficulties with social communication, repetitive behaviors, and making eye contact [5].
  2. Dysregulated Behavior Cluster: Challenges with temper tantrums, aggressive outbursts, or self-injury [5].
  3. Eat/Sleep Cluster: Problems falling or staying asleep, or unusual eating habits [5].
  4. Mood/Anxiety Cluster: Persistent feelings of worry, sadness, or low mood. This is particularly prevalent in adults [5].
  5. Neuropsychological Cluster: Struggles with memory, attention, and executive function (the brain’s ability to plan and organize) [5][6].
  6. Overactive/Impulsive Cluster: Symptoms of ADHD, such as being constantly “on the go” or acting without thinking [5][7].
  7. Scholastic/Occupational Cluster: Difficulties with reading, writing, or math that impact school performance or workplace success [5][6].

Screening: The TAND Checklist

Because TAND symptoms can change as a person grows and transitions into adulthood, the 2021 international guidelines recommend a “screen, act, repeat” approach [4][8].

  • The Tool: The TAND Checklist (now also available as a digital tool called TANDem) is a simple set of questions designed to be completed at least annually [9][10].
  • The Goal: The checklist is a screen, not a formal diagnosis. Its job is to “red flag” areas that need a deeper look by a specialist, such as a neuropsychologist, psychiatrist, or speech therapist [11].
  • The Action: Once a concern is identified, your care team should “act” by providing a formal evaluation and evidence-based treatments tailored to that specific cluster [4].

The Impact of Early Seizures

There is a complex relationship between brain activity and TAND. Children who experience infantile spasms or seizures that begin before age two are associated with an increased risk for more significant intellectual disabilities and autism [12][13].

Early, frequent seizures can disrupt the brain’s “wiring” during critical windows of development [14]. However, this is an association, and early epilepsy does not prove a single cause; TAND is influenced by brain development, the TSC variant, and other factors. While better seizure control is associated with improved cognitive outcomes, it does not eliminate the risk of TAND entirely, which is why regular screening remains essential for every person with TSC [15][16].

Actionable Steps for Patients and Parents

Managing TAND requires being a proactive advocate for mental and developmental health.

  • Request Annual Screening: If your clinic does not offer the TAND Checklist, ask for it specifically at every annual visit [8].
  • Seek Formal Evaluations: If the checklist highlights a struggle—such as attention, mood, or social skills—request a formal neuropsychological or psychiatric assessment. Objective testing often finds “hidden” deficits that aren’t obvious in daily life [17].
  • Partner with the School/Workplace: Use TAND screening results to help your school district understand that your child’s challenges are part of a biological condition, securing an Individualized Education Program (IEP). Adults can use this for workplace accommodations [18].
  • Transition to Adult Care: Adolescents need a plan to move into adult mental health services, supporting independence, relationships, and self-advocacy.
  • Don’t Forget Caregiver Support: TAND can be exhausting for families. High levels of “parenting stress” are common in the TSC community. Taking care of your own mental health is a vital part of taking care of your child [19].

Common questions in this guide

What does TAND mean in tuberous sclerosis complex?
TAND stands for TSC-Associated Neuropsychiatric Disorders. It is an umbrella term for challenges involving social communication, behavior, attention, learning, mood, sleep, and other aspects of thinking and daily life. TAND is not one single diagnosis.
How common are TAND-related concerns in people with TSC?
TAND-related concerns affect an estimated 77% to 88% of people with tuberous sclerosis complex. They can appear in childhood or adulthood and may change as a person develops or life circumstances change. Regular screening helps identify concerns that may not be obvious.
What are the seven TAND clusters?
The clusters cover autism-like social communication and repetitive behaviors; dysregulated behavior; eating and sleep; mood and anxiety; neuropsychological skills such as memory, attention, and planning; overactive or impulsive behavior; and scholastic or occupational skills such as reading, writing, and math. A person may have concerns in more than one cluster.
How often should someone with TSC complete TAND screening?
International guidelines recommend screening at least annually using the TAND Checklist or the digital TANDem tool. Screening is not a diagnosis; a concern should lead to a formal evaluation, and screening should be repeated as needs change.
Can early seizures increase the risk of TAND challenges?
Infantile spasms or seizures that begin before age two are associated with a higher risk of significant intellectual disability and autism. This is an association, not proof that seizures are the only cause; early seizure control may improve cognitive outcomes but does not remove the need for TAND screening.
What happens if TAND screening identifies a concern?
A TAND screen can point to a need for a formal neuropsychological, psychiatric, or speech-language evaluation. The care team can then recommend evidence-based therapies and practical supports, such as an Individualized Education Program at school or workplace accommodations for an adult.
How can families support a person with TAND?
Families can track daily challenges, request annual screening, and share results with schools or workplaces when seeking accommodations. Adolescents benefit from a plan for adult mental health care, and caregivers should also seek support for their own stress.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Can we complete the TAND Checklist (or TAND-SQ) today to identify which of the seven 'natural clusters' my child or I may be showing signs of?
  2. 2.Given my child's history of infantile spasms or early seizures, should we schedule a formal neuropsychological evaluation to establish a baseline for their cognitive development?
  3. 3.Can you refer us to a specialist for a behavioral or ADHD assessment, or a psychiatrist familiar with TSC in adults?
  4. 4.How can we incorporate TAND screening into our annual TSC clinic visits to ensure we don't miss new emerging concerns over the lifespan?
  5. 5.Based on the TAND results, what specific educational supports, workplace accommodations, or therapies should we be requesting?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (19)
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    Measurement of Developmental and Behavioral Concerns in Toddlers With Tuberous Sclerosis Complex.

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    Journal of neurodevelopmental disorders 2023; (15(1)):32 doi:10.1186/s11689-023-09500-1.

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This page is for informational purposes only and does not constitute medical advice. Discuss TAND screening, evaluations, seizure history, and support needs with your TSC care team.

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