This refers to when a doctor makes a wrong diagnosis, or when an accurate diagnosis is not made in a timely manner. This may lead to prescribing the wrong treatment or medication which at best may do nothing to treat the problem and at worst can aggravate the patient’s condition. While providing an accurate diagnosis is the responsibility of your doctor, other parties may be also involved. For example, a doctor may have made a wrong diagnosis due to errors in diagnostic tests caused by faulty equipment, or mixed or contaminated samples. Common conditions that doctors sometimes fail to diagnose include asthma, cancer, heart attack, or stroke.