Neurological complications
Here are some common examples:
After surgery: stroke, seizures, nerve injury, cognitive dysfunction.
After infections: encephalitis, meningitis, Guillain-Barré syndrome.
After trauma: traumatic brain injury, spinal cord injury, nerve compression.
Due to systemic diseases: diabetic neuropathy, hypertensive encephalopathy.
As side effects of treatments: chemotherapy-induced neuropathy, radiation-induced brain injury…