If you recently suffered a head injury at work, you may not experience any concerning symptoms. While you may immediately notice some surface symptoms due to the initial head injury, you must be aware of other symptoms that may not appear until days or weeks after your initial injury. You can expect a quick recovery from a mild concussion, but you should still look for the following symptoms.  Headache  Tiredness Dizziness Nausea Traumatic brain injuries can lead to permanent brain damage or even death. Symptoms of a traumatic brain injury include:  Severe headache  Continuous nausea and or vomiting  Disorientation and or confusion Loss of consciousness  Seizures  Slurred speech Changes in mood and behavior  Blurry vision and or dilated pupils  Tinnitus or ringing in the ears.