Ever increasing data about head injuries.

The effects might be subtle or dramatic, singular or myriad:

• Physical conditions, such as headaches, seizures, hearing loss, and vision issues, including seeing double, blurriness, eyestrain, light sensitivity, and depth-perception dysfunction.

• Hormonal disruption resulting in blood-sugar dysregulation and emotional problems, such as depression, anxiety, mania, or apathy.

• Digestive issues, including microbial changes, motility problems, and increased gut permeability.

• Behavioral upsets like sleep disturbances, impulsivity, aggression, even psychosis.

• Cognitive issues including problems with attention, memory, language, and executive functions, such as organizing, planning, sequencing, and monitoring or modifying behavior.

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