What is overtreatment?

Some articles on overtreatment:

Therapy
... Overtreatment is an overutilization, a treatment that is unnecessary or disproportionate to the situation ... a condition that causes no symptoms and will go away on its own is overtreatment ... could be remedied with very limited treatment is overtreatment ...
Desiccated Thyroid Extract - Thyroid Extract Proponents
... amounts from T4 as most people do? Is the perceived benefit simply a result of overtreatment, such that the same relief could be achieved by pushing a thyroxine dose to higher levels ... effect of high doses, similar to caffeine or amphetamine? How high is the risk of prolonged overtreatment to the bones, heart, and other parts of the body, and is it worth an improvement in subjective well-being ...