It

Pronoun

  is

Auxiliary

  one

Numeral

  of

Adposition

  the

Determiner

  most

Adverb

  painful

Adjective

  conditions

Noun

  and

Coordinating conjunction

  can

Auxiliary

  result

Verb

  in

Adposition

  depression

Noun

.

It is one of the most painful conditions and can result in depression.

It is one of the most painful conditions and can result in depression.