The most significant sign of head trauma depends on the severity and location of the injury. However, some common signs of head trauma can include loss of consciousness, headache, dizziness, confusion, memory loss, vomiting, seizures, slurred speech, and difficulty walking or balancing. In more severe cases, there may be bleeding from the ears or nose, paralysis, or a decreased level of consciousness. It's important to seek immediate medical attention if you suspect someone has experienced head trauma.