You must remember this

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Across
  1. 3. Related to strong feelings
  2. 6. The main tune of a song
  3. 7. Treatment that helps someone feel better or recover
  4. 8. A condition that affects memory and thinking
  5. 9. Unable to hear or having serious difficulty hearing
Down
  1. 1. The period of life when you are an adult
  2. 2. Easy to remember, especially a song or tune
  3. 4. Easy to remember or unforgettable
  4. 5. A disease that causes problems with memory and thinking