I can recall hearing my parents shouting as I awoke when I was around 7 years old. They were arguing over something in the living room that I was unable to understand at the time. I noticed that they were making violent hand gestures at one another when I opened my door. When they realized I had witnessed their argument, they immediately stopped and turned to face me as I began to cry. I sprinted back to my room in fear and panic, hiding in the area between my bed's headboard and the wall because I was afraid of my parents' strength and rage toward each other. They approached me after seeing me hiding and attempted to give me a hug. To this day, that memory remains with me, as it was the first time, I witnessed a side of my parents I never knew they had. Childhood trauma can have long-lasting effects on a person's behavior, which may lead to teenagers developing traumatic stress, causing changes in their behavior, and, if unresolved, may linger into adulthood. 
The NCTSN (National Child Traumatic Stress Network) defines childhood trauma as a traumatic event that people experience as a child, whether it’s scary, dangerous, violent, or life-threatening. These experiences can include the loss of a loved person, abuse (psychological, physical, sexual), natural disasters, abandonment, absent parents, serious accidents, and so on. You would think that younger children, especially those between the ages of 2 and 7, might not be able to recall what happened to them, but it can have a lifetime impact. In fact, according to "Promises Behavioral Health," children can remember traumatic experiences, even if they can't recall every detail of what happened, they can still remember how it felt, which can later influence how they act and react. No one’s ever sure if a child's trauma is permanent, but it's important to recognize the signs that a child may need professional help to deal with their trauma. This can be beneficial to do while they're young because it can prevent the trauma's effects from lingering into adulthood.   
One thing that should be noted is that traumatic stress in a child occurs from the child's reaction to the traumatic event itself. These said reactions could be a wide range of things, such as changes in their behavior and psychology. As noted by SAMHSA, high school students with traumatic stress displayed changes in their behaviour such as developing eating disorders, abusing substances and becoming sexually active. Their psychology was also affected, as say they stated having no feelings about the event, or on another extreme started discussing the traumatic events in detail. All that being said, teenagers with past traumas who turn to self-destructive behaviours and coping mechanisms need the support of their closest ones to recover. With the support of their close ones, the teens can heal and learn to cope with these traumas in healthier and more effective ways. NCTSN states “the majority of children may recover and go on to live fulfilling lives when they are aware that their parents are trying to keep them safe and support them in understanding their reactions to trauma.” In other words, children link their self-worth to how much importance their closest ones put to them and the events they've been through. For example, NCTSN says “A child who has experienced abuse will feel hopeless, unloved, and will frequently put the blame on themselves.” To put in short, these complex past traumas usually lead to children feeling deep sense of remorse as well as problems with self-image and worth.  
Children with severe traumatic experiences may struggle to think clearly or solve problems. They might not be able to think about the future, make predictions, or take appropriate action. According to the National Child Traumatic Stress Network, "when a child grows up in a constantly dangerous environment, all of their internal resources are directed toward surviving."  NCTSN also states that children's bodies and minds have formed a "chronic stress response mode" that might make it challenging to reason through a situation calmly and consider all of the potential solutions. They could have trouble trying new skills or learning new information. They could also have trouble maintaining focus or become distracted by emotional responses to traumatic memories. This can lead to difficulties in their capacity for complex concepts and their language development.   
Additionally, childhood trauma can have long-lasting effects on an adult. These effects may linger into adulthood if the trauma they experienced as children is not treated and resolved. Trauma may impact future relationships, which can result in other problems, including depression and low self-esteem. An adult with childhood trauma can struggle with problems such as fears or eating disorders. Kimanne Foraker-Koons states that if adults deal with particular issues in their life, such as eating disorders, panic attacks, or depression, it is impossible for them to be completely present in a loving relationship. According to Brittany Loggins, adults with trauma are more likely to have suicidal thoughts and are also more likely to engage in drug and alcohol use. Eventually, later in life, they are likely to develop medical conditions like diabetes and heart disease. Loggins also says that professionals are researching the theory that understanding a patient's background and the impact of any trauma they may have had could lead to improved therapy that could help with the prevention of some illnesses and symptoms. These experiences might also have specific impacts on the brain, which is why therapy could be improved by advances in technology allowing us to learn more about the brain and how it has been impacted.  
  In conclusion, childhood trauma has the potential to define and have an impact on a person's life, which can influence their teenage years. If not treated and resolved, childhood trauma can have long-lasting effects on a person's behavior and personality, which can affect how they approach problems in the future. Trauma can prevent people from having healthy relationships and can result in the development of medical conditions, as numerous experts have shown. Consequently, experts think that enhancing therapy through technological developments will help us understand the brain and its effects better so that the patient can get the best treatment.