Symptoms of depression can manifest themselves differently in different people and that may be why it is not always obvious that a person may be suffering from depression. Depression can have both physical and psychological symptoms, so you need to be looking for both when assessing whether or a not you or a loved one may be suffering from depression. Despite the differences in the way in which depression can present itself, there are a few signs/symptoms that one should not ignore.
You can read the article to get educated about four common but can be subtle symptoms of depression:
https://www.popsugar.com/fitness/Mental-Emotional-Symptoms-Depression-44166832