Repeated headbutting your phone occasionally over 2–3 years is unlikely to cause chronic traumatic encephalopathy (CTE). CTE usually develops from multiple, significant head injuries or repeated concussions, often seen in contact sports or severe trauma. However, frequent head impacts—even minor—can increase the risk of concussion or brain injury over time. It’s safer to avoid head impacts and find healthier ways to manage anger or frustration. If you’re concerned about your behavior or head injuries, consider talking to a healthcare professional. If you have any further questions or need more clarity, please consult with a psychiatrist. If you`re in Texas, we welcome you to reach out to www.MidCitiesPsychiatry.com, we`re here to help you.