From Cambridge dictionary,
- stress - great worry caused by a difficult situation.
- distress - extreme worry, sadness, pain.
I'm not sure if the words 'distress' and 'stress' have the same meaning but I have seen people use them interchangeably in some situations. I have also looked into Oxford Thesaurus dictionary there appears to be no relation between them. So, I'm just confused if both mean the same thing and can be used in place of another word?