痟

xiāo
  1. (obsolete on its own in Standard Chinese) headache
  2. (obsolete on its own in Standard Chinese) short for 消渴病 (“diabetes”)
  3. (obsolete on its own in Standard Chinese) to decline; to wane
  4. headache
  5. short for 消渴病 (“diabetes”)
  6. to decline; to wane

Wiktionary