Tuberous sclerosis complex (TSC) is a rare, autosomal dominant genetic condition caused by mutations in the TSC1 or TSC2 gene, both of which normally help regulate a cellular growth pathway called mTOR. When that pathway runs unchecked, it causes benign tumors called hamartomas to form in the brain, kidneys, heart, skin, lungs, and eyes, and it is a leading genetic cause of epilepsy in infancy and childhood. Because seizure control and tumor surveillance dominate so much of TSC's medical story, it has long been treated first and foremost as a seizure and tumor disease requiring lifelong monitoring. But that framing leaves out a major part of the picture — up to three in five children with TSC also carry a diagnosable psychiatric condition, and whether or not a drug exists to treat the TSC mutation directly turns out not to be the deciding factor in whether that psychiatric burden gets better.
How Common Are Psychiatric Conditions in Children With TSC?
A 2025 study followed 121 children with TSC treated at a children's hospital in Hangzhou, China, between April 2021 and December 2023. Researchers found that 70 of the 121 children, or 57.85%, had at least one comorbid psychiatric disorder: 42.15% had autism spectrum disorder, 40.50% had ADHD, 14.05% had an anxiety disorder, and 11.57% had depression. Several factors tracked closely with seizure burden. Children with seizure frequency greater than once a month had over six times the odds of an autism diagnosis, and children who had experienced infantile spasms had nearly 26 times the odds. Longer seizure duration and higher seizure frequency were also linked to greater odds of anxiety or depression, suggesting that the more aggressively seizures affect a child's early life, the more likely a psychiatric condition is to follow.
The Daily Realities of Living With TSC
- Seizures and psychiatric symptoms can arrive together. Because the same underlying seizure activity that researchers link to autism and anxiety often starts in infancy, families may be managing a new psychiatric concern at the same time they are still adjusting to a seizure diagnosis, with little space to catch their breath in between.
- A single diagnosis can touch nearly every organ system. Routine care for TSC can include a neurologist for seizures, a nephrologist for kidney tumors, a cardiologist for heart tumors, a dermatologist for skin findings, and a pulmonologist for lung involvement, and coordinating that many specialists is its own ongoing task.
- Overlapping conditions can make any single one harder to spot. With autism, ADHD, anxiety, and depression all elevated in the same population, and autism itself identified as a risk factor for later ADHD, a new behavior change can have more than one plausible explanation, which can slow down getting the right support in place.
- School and learning support often needs its own advocacy. Intellectual disability and developmental delay are common alongside TSC, and getting an individualized education plan or classroom accommodations in place usually requires active, ongoing follow-up from caregivers rather than something that happens automatically.
- Mood and anxiety symptoms can be easy to miss amid medical appointments. When seizure control and tumor surveillance already fill the calendar, quieter symptoms like persistent worry or low mood can go unspoken in a busy visit focused on physical health.
A Formal Framework for Screening the Psychiatric Side of TSC
In 2023, an international consortium of clinicians, researchers, and family representatives published consensus recommendations for what they term TSC-Associated Neuropsychiatric Disorders, or TAND. The group, known as the TANDem project, identified seven natural clusters of difficulty that commonly occur in TSC: autism-like features, dysregulated behavior, eating and sleeping problems, mood and anxiety symptoms, neuropsychological difficulties, overactivity and impulsivity, and scholastic skills, alongside a wraparound set of psychosocial recommendations for the whole family. Their central recommendation is a three-step cycle: screen for TAND at least once a year, act on whatever is found with an appropriate next step, and then repeat the cycle, so that psychiatric and developmental difficulties are caught and addressed as early as the seizures and tumors that have traditionally been TSC's medical focus.
Why Treating the Tumors Doesn't Automatically Treat the Mind
It would be reasonable to assume that a drug targeting the TSC1/TSC2 mutation's underlying mTOR pathway, which is already FDA-approved for shrinking TSC-related tumors, might also ease the psychiatric and cognitive difficulties that share the same genetic root cause. A 2019 randomized, double-blind, placebo-controlled trial tested exactly that idea, assigning 32 children with TSC to 12 months of the mTOR-inhibitor drug everolimus or placebo. The result was a clear null finding: everolimus produced no benefit on full-scale IQ, and no effect on any secondary outcome either, including autism symptoms, neuropsychological functioning, behavioral problems, social functioning, communication skills, executive functioning, sleep, or quality of life. The study's authors concluded that using everolimus with the goal of improving cognitive function and behavior in this age group should not be encouraged. In other words, treating the physical disease at its molecular source did not translate into treating the mind, which is exactly why the TAND framework calls for psychiatric and developmental care to be screened for and delivered on its own, rather than assumed to follow automatically from physical treatment.
Supportive Strategies for Individuals and Families
- Ask specifically about annual TAND screening. Because TAND is a named, structured framework with its own checklist, caregivers can ask their TSC care team directly whether annual screening is in place rather than waiting for a concern to surface on its own.
- Treat seizure control as connected to, but not the same as, psychiatric care. Given how closely seizure frequency and duration track with psychiatric risk in the research, working toward the best possible seizure control is valuable, but it is worth pairing with its own separate conversation about mood, behavior, and development.
- Build a single care coordination plan across specialists. A shared record, a designated point person, or a care coordinator can reduce the burden of relaying the same history to a neurologist, nephrologist, cardiologist, dermatologist, and pulmonologist separately.
- Pursue an educational evaluation proactively. Given how common intellectual disability and learning differences are in TSC, requesting a formal school evaluation early, rather than waiting for a struggle to become obvious, can open the door to support sooner.
- Connect with other TSC families for practical, lived-experience knowledge. Patient organizations and support communities built specifically around TSC can offer insight into navigating TAND screening, school accommodations, and multi-specialist care that a single clinical visit often can't cover.