see also:

• allodynia - painful touch when there should not be pain
• neurology

• hyperalgesia is an increased sensitivity to painful stimuli
• allodynia - painful touch when there should not be pain is pain felt with non-painful stimuli
  • affects 15-50% of people with neuropathic pain

• referred hyperalgesia
  • pain felt near a painful region
  • this could be observational when seeing someone else in pain
• visceral hyperalgesia
  • a form of deep pain

• NB. many of these causes can also cause allodynia - painful touch when there should not be pain
• excessive sensitivity of pain receptors
  • burns
  • trauma
  • cellulitis
  • toxins from bites or stings
  • diabetic neuropathy
  • opioid-induced hyperalgesia
  • systemic lupus erythematosus (SLE)
  • multiple sclerosis (MS)
  • CNS viral infections: herpes zoster (shingles), Herpes simplex virus (HSV)
  • migraines
  • complex regional pain syndrome