When you don't know what's wrong, the doctors say your "fine" but you feel sick and tired all the time anyway. Sometimes it's less depressing when you know you're really sick, rather than to just feel blah, yet noting seems to be wrong.
any kind of illness can cause depression...
but its all in the way you as an individual deal with it! :)
Yeah, those really suck...do you take pyridium along with your antibiotics? Helps immensely with the pain.
For me it would be lack of sleep...but I guess that's not really an illness.
Thyroid problems can cause depression.