• Tension headaches affect the entire head and may feel like pressure. They often last from 30 minutes to 1 week
• Cluster headaches are typically limited to one side of the head. Individuals may also have severe pain located around one eye, show tearing, and have a red eye
• Migraine headaches are recurrent and pulsating. Typically, they only affect one half of the head. Sometimes individuals will see an “aura” before a migraine starts and they may also experience vomiting, sensitivity to light, sound, or smell 
• Musculoskeletal headaches are common with whiplash. These headaches worsen when bending over, stooping, or exerting oneself. Individuals may also have dizziness, imbalance, and a sensitivity to light and sound

Possible causes:

• Muscle tension or spasms
• Injury to the brain such as a bruise (concussion) or laceration (tear)
• Nerve fibers of the brain being stretched or sheared from trauma
• Common triggers include: dehydration, irregular meals, caffeine and stress

Possible complications:

• Inability to tolerate light and noise making it difficult to participate in activities within or outside the home
• Depression and anxiety as a result of ongoing headaches
• Difficulty sustaining attention, problem solving and may experience cognitive fatigue more quickly