You cannot receive the medical treatment you need for your condition if the condition is not diagnosed correctly. When a condition is diagnosed as another specific condition, you can receive treatment for the assumed condition, which can at best, be useless and at worst, be harmful while your actual condition goes untreated. This can be as bad as having your condition diagnosed much later than it should have been, which is another scenario that can put you in a position where your condition becomes worse and worse as it goes untreated.
When a delayed or wrong diagnosis could have been prevented if the doctor or another medical professional had taken greater care, the patient can file a medical malpractice claim to seek compensation for his or her damages. One specific type of medical malpractice claim is a cancer misdiagnosis claim.