For most of human healthcare, we assumed that our symptoms were the problem. 

We have moved past that now to a large extent. For example: we know that the virus is the problem, not the green snot. Mucus is just a byproduct of healthy immune function.

Prior to the microscope, we naturally assumed the redness and swelling of an infection was ‘the problem’. But since microscopes, we know our swelling is the body’s vital inflammatory response and the actual problem was an invasion of hostile microbes. Through this deepening of scientific understanding, we’ve moved past ‘symptom blaming’. Somewhat. Because we still very much do it with pain.