Suffering can be a noun, verb, or adjective.

Noun: The suffering that the family went through was almost unbearable.

Verb: The dog was suffering a leg wound.

Adjective: The suffering father mourned over his daughter's passing.

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There are many sufferings from overexposure to UV. It is because of the high energy of these.

If you are suffering from being sick and need to write a letter or email, you should simply state that you apologize but you aren't feeling well and can't attend work. You don't need to go into details. Keep your letter polite and professional.

suffering