internally  
adverb uk/ɪnˈtɜː.nəl.i/ us/ɪnˈtɝː.nəl.i/
  (INSIDE PERSON)      
 内心地;内在地
in a way that exists or happens within a person's mind
  What I did was symbolic of how I was feeling internally. 我的所作所为足以表达我的内心感受。 
 - More examples
 - Castor oil can be used internally as a laxative as well as on the skin.
 - If melanoma spreads internally, there is little that can be done.
 - It may have looked like easy success but I was struggling so much internally.
 - She was internally burnt out and exhausted.
 
See: internal