Post-concussion syndrome is a complex disorder in which various symptoms – such as headaches and dizziness – last for weeks and sometimes months after the injury that caused the concussion. In most people, symptoms occur within the first seven to ten days and go within three months but can persist for a year or more.
Symptoms include headaches, dizziness, fatigue, irritability, anxiety, insomnia, loss of concentration and memory, ringing in the ears, blurry vision, nose and light sensitivity, and, although rarely, decreases in taste and smell.
Post-concussion Syndrome. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/post-concussion-syndrome/symptoms-causes/syc-20353352