If you have your health, you have everything - or so they say. Not everyone is blessed with good or uncomplicated health issues. For those that do have health issues, the best medical care is not only expected, it's necessary. If a person received healthcare they believe to be inadequate, or even harmful, how does one proceed?
What matters is if a person has suffered injury due to insufficient medical care. This could manifest in many ways, but one way a person can be seriously injured due to faulty medical care is at the stage of diagnosis. A misdiagnosis can quickly lead to complications as the treatment received often doesn't address the medical condition correctly. This lost time can cause the person's health to worsen in a harmful way.
That's how misdiagnosis and worsened medical condition are connected, they have a causal relationship. If a person believed they were misdiagnosed (and often the evidence will be glaringly obvious) it can quickly lead to worsened medical condition. While a person received treatment for a condition or injury they do not have, the true medical issue goes unaddressed and unmonitored. It's possible to seek damages due to the injuries a person has suffered due to a misdiagnosis.
This would occur in a personal injury suit. Getting a second opinion for the diagnosis you have been given by a medical provider can confirm suspicions one has about the previous misdiagnosis. It can also give a person access to the treatment plan they should have received the first time, for their actual medical condition. Misdiagnosis happens and it can cause serious injuries.