Symptoms of post-concussion syndrome include:
- Headache (most common) that feels like:
- Pressure in the head
- A tight band around the head
- The head is blowing up like a balloon
- The head is being pulled apart between the eyes
- May feel different from other headaches you have experienced
- Dizziness
- Lightheadedness
- Neck pain
- Sensitivity to light or sound
- Tiredness/fatigue
- Ringing in the ears (tinnitus)
- Balance problems
- Vision problems
- Irritability
- Nervousness
- Anxiety
- Depression
- Mood swings
- Sleep problems
- Problems paying attention
- Problems thinking clearly
- Confusion
- Memory problems
- Difficulty focusing or concentrating
- Feeling mentally slowed
- Reduced tolerance to stress, emotional excitement, or alcohol
- Decreased taste and smell (rare)
What Is Post-Concussion Syndrome?
Post-concussion syndrome, or persistent post-concussion symptoms, is a cluster of symptoms of a brain injury (concussion) that last longer than the normal expected time frame for recovery.
What Causes Post-Concussion Syndrome?
Post-concussion syndrome is caused by a concussion, which is a form of brain injury. When concussion symptoms do not go away after the expected recovery time, this is considered post-concussion syndrome.
Causes of concussions include:
- Motor vehicle accidents
- Falling
- Injuries from contact sports such as football, ice hockey, soccer, and boxing
- Combat injuries such as from blasts and bullet wounds
Risk factors that may contribute to developing post-concussion syndrome include:
- Severe impact
- Longer duration of initial concussion symptoms
- Being hit twice in a short time
- Four or more symptoms that occur in the early stages of the concussion
- Significant visual symptoms immediately following the injury
How Is Post-Concussion Syndrome Diagnosed?
Post-concussion syndrome is diagnosed with a patient history and physical examination, along with tests to assess the severity of the brain injury, such as:
- Computerized tomography (CT) scan
- Magnetic resonance imaging (MRI) scan
- Positron emission tomography (PET) scan
- Blood biomarkers
What Is the Treatment for Post-Concussion Syndrome?
The goal of treatment of post-concussion syndrome is to relieve symptoms, and may include:
- Physical therapy
- Cognitive behavioral therapy
- Vision therapy
- Graduated exercise therapy
- Light therapy (photobiomodulation) (currently being researched)
From 
Migraines and Headaches Resources
https://www.uptodate.com/contents/postconcussion-syndrome-the-basics?search=Post-Concussion%20Syndrome&source=search_result&selectedTitle=2~16&usage_type=default&display_rank=2
https://www.cognitivefxusa.com/blog/concussion-headaches-and-post-concussion-headaches