Play therapy is an evidence-based treatment for a range of childhood emotional and behavioral difficulties. A meta-analysis of controlled studies found that children who received play therapy scored, on average, 25 percentile points higher on outcome measures than children who received no treatment, with a moderate-to-large effect size of 0.66. That result was statistically significant, meaning the improvement was unlikely due to chance.
That said, “evidence-based” isn’t a simple yes-or-no label. The strength of the evidence varies depending on the type of play therapy, the condition being treated, and how it compares to other options like cognitive behavioral therapy. Here’s what the research actually shows.
What Play Therapy Looks Like in Practice
Play therapy uses toys, games, art, and imaginative play as a child’s primary mode of communication. Where adult therapy relies on talking through problems, play therapy lets children express feelings and work through difficulties using the language they already know: play. A therapist observes, reflects, and sometimes guides the child’s play to help them process emotions they may not have words for.
The most widely studied form is Child-Centered Play Therapy (CCPT), where the therapist follows the child’s lead rather than directing the session. Other approaches include cognitive behavioral play therapy, which adds more structure and teaches specific coping skills through play-based activities. A typical course of CCPT involves one-on-one sessions lasting about 45 minutes each, with 35 to 40 sessions recommended for the full protocol, though session frequency and total duration are adjusted based on the child’s needs.
Conditions With the Strongest Evidence
Play therapy has been studied across a broad range of childhood difficulties. The conditions with the most research support include anxiety, depression, behavioral problems, trauma, and post-traumatic stress disorder. A meta-analysis of 17 randomized controlled trials found it effective in reducing symptoms across all three categories: anxiety, depression, and behavioral problems.
It’s also used for children going through major life transitions (parental divorce, a new sibling, moving, loss of a loved one) and for relationship difficulties, including trouble connecting with peers or caregivers. For trauma specifically, modern approaches like cognitive behavioral play therapy provide structured tools for helping children process traumatic experiences in a developmentally appropriate way.
How It Compares to Cognitive Behavioral Therapy
One of the most informative studies on this question is a randomized clinical trial comparing individual CBT to child-centered therapy for childhood anxiety disorders. Both treatments produced meaningful results. At the end of treatment, 55.8% of children in the child-centered group responded to treatment compared to 71.1% in the CBT group. That difference in response rates was not statistically significant, meaning both approaches helped a majority of anxious children improve.
Where CBT pulled ahead was in full recovery. About 66.7% of children receiving CBT were in full recovery after treatment, compared to 46.5% in the child-centered group. One year later, the gap widened: 82.2% of the CBT group had fully recovered versus 65.1% of the child-centered group. Children in the CBT group also reported lower negative emotions in response to real-life stressful events during the later stages of treatment, after exposure-based exercises were introduced.
The takeaway isn’t that play therapy doesn’t work for anxiety. It clearly does for many children. But for anxiety disorders specifically, CBT appears to produce more durable and complete recovery. For younger children who aren’t developmentally ready for the structured thinking exercises CBT requires, play therapy may be the more practical and effective starting point.
Why Play Matters for Brain Development
The therapeutic value of play isn’t just a clinical theory. Neuroscience research helps explain why play experiences shape how children’s brains handle stress and social challenges. Studies on brain development show that play directly affects the prefrontal cortex, the region responsible for decision-making, impulse control, and flexible thinking.
Animals deprived of play during key developmental windows respond more impulsively when tasks become demanding and react inappropriately to challenging social situations as adults. At the cellular level, play deprivation reduces how responsive brain cells in the prefrontal cortex are to chemical signaling, making them less efficient at processing information. Conversely, ample play experience during development leads to prefrontal neurons that are more streamlined and better at adapting to new situations. The prefrontal cortex, along with brain areas involved in emotion and reward, appears to be the primary beneficiary of playful experiences.
This neurobiological evidence supports the premise behind play therapy: that guided play isn’t just a way to keep children comfortable in a therapy setting. It engages the very brain systems involved in emotional regulation, social competence, and cognitive flexibility.
The Effect of Involving Parents
One variation called filial therapy trains parents to conduct structured play sessions with their children at home, using techniques they learn from a therapist. A meta-analysis comparing filial therapy to standard play therapy found that filial therapy produced larger treatment effects overall.
A randomized controlled trial tested filial therapy with children who had cancer. Children in the filial therapy group showed significant reductions in depression scores, while children in the control group showed no change. The benefits extended to the parents themselves: mothers in the filial therapy group had significantly lower depression, anxiety, and stress scores after the intervention, while the control group’s scores stayed essentially flat.
This makes intuitive sense. Children spend far more time with parents than with therapists, so equipping parents with therapeutic play skills extends the treatment into daily life. It also strengthens the parent-child relationship, which is itself a protective factor for children’s mental health.
Limitations of the Evidence
Play therapy’s evidence base is solid but not uniform. The strongest research supports its use for general emotional and behavioral difficulties in children. For specific clinical diagnoses like anxiety disorders or PTSD, more structured treatments like CBT often have a deeper pool of randomized controlled trials and, in some cases, produce stronger long-term outcomes.
Another limitation is that many play therapy studies use relatively small sample sizes, and treatment protocols can vary widely between practitioners. The recommended 35 to 40 sessions for CCPT represents a significant time commitment, and not all families or school settings can sustain that frequency. Shorter courses of treatment may still be helpful but have less research backing the optimal minimum dose.
Play therapy is recognized as an effective, evidence-based treatment by mental health clinics, school systems, and professional organizations worldwide. It is not a fringe or unproven approach. At the same time, it works best when matched to the right child and the right problem, as is true for every form of therapy.