The placebo effect has been attributed to empathy. If someone is in pain and they receive a placebo, they feel better. This is because it seems that someone empathized with them or cared.
Empathic Healthcare) OXFORD EMPATHY PROGRAMME: Jeremy Howick
http://sco.lt/65mDT7
The effect of patient-practioner communication on pain: a systematic review.
Mistiaen P, van Osch M, van Vliet L, Howick J, Bishop F, Di Blasi Z, Bensing J, van Dulmen S.
European Journal of Pain (2015). DOI: 10.1002/ejp.797.
https://www.ncbi.nlm.nih.gov/pubmed/26492629