What Are the Top 7 Medical Errors?

November 1, 2025 | By Queller, Fisher, Washor, Fuchs & Kool
What Are the Top 7 Medical Errors?

When we seek medical care, we place an immense amount of trust in the doctors, nurses, and healthcare professionals responsible for our well-being. We trust their training, their judgment, and their commitment to our health. Most of the time, that trust is well-placed. But when a preventable mistake occurs, the consequences can be devastating, altering lives in an instant.

These situations are often complex and emotionally unsettling, leaving patients and their families feeling lost and confused. Recognizing that a negative health outcome may have been caused by one of the top medical errors can empower you to ask the right questions and seek the support you need from medical malpractice lawyer during a difficult time.

Schedule a Free Case Evaluation

Key Takeaways about the Top Medical Errors

  • Medical errors are preventable adverse effects of care, which can range from minor to catastrophic.
  • Common categories of medical errors include misdiagnosis, surgical mistakes, medication errors, and birth injuries.
  • A medical error may constitute medical negligence when a healthcare provider deviates from the accepted "standard of care," causing harm to a patient.
  • These errors can happen in any healthcare setting, including hospitals, clinics, and pharmacies.
  • Documenting your experience and gathering medical records are important steps if a medical error is suspected.
  • Understanding the types of errors can help patients and their families identify when a negative outcome might have been preventable.

Understanding Medical Negligence: When a Mistake Becomes Malpractice

Words medical errors collected from wooden cubes with judge's gavel on table, doctor with stethoscope in background.

Not every negative medical outcome is the result of an error. Medicine is an intricate field, and some conditions are difficult to treat. However, there is a distinct line between an unfortunate but unavoidable result and an injury caused by negligence. This is where the concept of the "standard of care" becomes important.

The standard of care is the generally accepted level of skill and diligence that a reasonably competent healthcare professional in the same specialty would provide under similar circumstances. When a provider’s actions fall below this standard and directly cause a patient harm, it may be considered medical negligence or malpractice. It’s not about perfection; it’s about providing responsible, competent care.

1. Misdiagnosis, Delayed Diagnosis, and Failure to Diagnose

One of the most frequent and harmful of the top medical errors involves diagnosis. A correct and timely diagnosis is the foundation of effective medical treatment. When that foundation is flawed, the entire course of care can be compromised, often with severe consequences.

  • Misdiagnosis: This occurs when a doctor incorrectly identifies a patient’s illness. For example, diagnosing a heart attack as simple indigestion or a pulmonary embolism as anxiety. The patient may then receive treatment for the wrong condition, which can be ineffective and potentially harmful, while the real illness progresses untreated.
  • Delayed Diagnosis: In this scenario, the doctor eventually makes the correct diagnosis, but only after a significant and harmful delay. For many conditions, like cancer or stroke, early intervention is critical. A delay can mean the difference between a full recovery and a permanent disability or worse.
  • Failure to Diagnose: This is when a doctor overlooks a condition entirely, often dismissing a patient's symptoms or failing to order necessary tests. The patient is left without any treatment as their condition worsens.

These diagnostic errors can prevent a patient from receiving the life-saving care they desperately need.

2. Surgical and Procedural Errors

Going into surgery requires an incredible leap of faith. We trust the entire surgical team to be focused, precise, and diligent. While the vast majority of surgeries in New York and across the country are successful, preventable errors in the operating room can and do happen. These are sometimes called “never events” because they are mistakes so serious they should never occur.

These devastating errors can happen before, during, or after the procedure itself.

  1. Wrong-Site Surgery: This is one of the most shocking errors, where a surgeon operates on the wrong part of the body—for instance, the left knee instead of the right.
  2. Wrong-Patient Surgery: In a busy hospital environment, mix-ups can lead to a patient undergoing a procedure that was intended for someone else.
  3. Wrong-Procedure Surgery: A surgeon performs an incorrect operation, such as a gallbladder removal when an appendectomy was scheduled.
  4. Retained Surgical Instruments: Sponges, clamps, or other tools are accidentally left inside a patient's body after the incision is closed, often leading to severe infections and requiring additional surgery.
  5. Nerve or Organ Damage: A slip of the hand or a lack of precision can result in the accidental perforation of a nearby organ or the severing of critical nerves, causing permanent damage.

Proper pre-operative verification protocols and checklists are designed to prevent these exact scenarios, but breakdowns in communication or procedure can lead to tragic outcomes.

3. Medication and Prescription Drug Errors

Text MEDICAL ERROR on a white background. There are different medicines around.

Medication is a cornerstone of modern medicine, but the wrong drug, the wrong dose, or a harmful interaction can be just as dangerous as the illness it's meant to treat. Medication errors can occur at any point in the process, from the doctor’s prescription pad to the nurse administering the dose at the bedside.

  • Prescribing Errors: A doctor may prescribe the wrong medication for a condition, select an incorrect dosage, or fail to check for dangerous interactions with other drugs the patient is taking.
  • Dispensing Errors: A pharmacist might misread a prescription and provide the wrong drug or the wrong concentration. This can happen in a large pharmacy chain or a local neighborhood drugstore.
  • Administering Errors: A nurse or other healthcare provider in a hospital or clinic setting could give a medication to the wrong patient, use the wrong route (e.g., intravenous instead of oral), or administer it at the wrong time.

According to the World Health Organization (WHO), unsafe medication practices and errors are a leading cause of avoidable harm in healthcare systems across the globe. These mistakes can cause severe allergic reactions, organ damage, and other life-threatening complications.

4. Anesthesia Errors

Anesthesia is a medical marvel that makes modern surgery possible, but it carries significant risks. The anesthesiologist is responsible for carefully calculating dosages, administering the drugs, and monitoring the patient’s vital signs continuously throughout a procedure. A small miscalculation or a moment of inattention can have profound consequences.

Common anesthesia errors include:

  • Dosage Errors: Giving a patient too much anesthesia can lead to brain damage, coma, or death. Too little can result in "anesthesia awareness," a terrifying experience where the patient is paralyzed but can feel pain and is aware of the surgery.
  • Failure to Monitor: The anesthesiologist must closely watch the patient's heart rate, blood pressure, and oxygen levels. Failing to notice and respond to a dangerous drop in these vitals can be catastrophic.
  • Delayed Intubation: If a patient has trouble breathing, the anesthesiologist must intubate them (insert a breathing tube) quickly. A delay can starve the brain of oxygen.
  • Improper Patient Evaluation: Failing to take a complete medical history to identify allergies or potential complications can lead to a preventable crisis in the operating room.

The margin for error is incredibly small, and a mistake can alter a person's cognitive and physical abilities forever.

5. Injuries During Childbirth (Birth Injuries)

The birth of a child should be a joyous occasion. For most families, it is. But when a medical professional’s mistake during labor or delivery causes harm to the mother or baby, that joy can turn into a lifetime of challenges and heartbreak. While some birth complications are unpredictable, many of the top medical errors in this category are caused by a failure to recognize and respond to signs of fetal distress or other problems.

Preventable birth injuries can include:

  • Cerebral Palsy: This group of movement disorders can be caused by a lack of oxygen to the baby’s brain during a difficult or prolonged delivery.
  • Brachial Plexus Injuries (Erb's Palsy): This occurs when the nerves in the baby's shoulder and arm are damaged, often because of excessive force used during delivery.
  • Failure to Order a C-Section: When signs of fetal distress are present or labor is not progressing, a timely decision to perform a Cesarean section can be critical. A delay can be devastating.
  • Misuse of Forceps or Vacuum Extractor: These tools can be helpful, but improper use can cause skull fractures, brain bleeding, and nerve damage.

These injuries often require a lifetime of specialized care, therapy, and medical support, placing an enormous emotional and financial burden on families.

6. Healthcare-Associated Infections (HAIs)

Hospitals are places for healing, but they can also be places where patients acquire serious infections. Healthcare-Associated Infections (HAIs) are infections that patients get while receiving treatment for other conditions. While not all HAIs are preventable, many are the direct result of lapses in hygiene protocols, such as unwashed hands, improperly sterilized equipment, or contaminated surfaces.

This risk exists in any medical facility, from the largest hospitals in Manhattan to smaller clinics throughout the Bronx. According to the Centers for Disease Control and Prevention (CDC), on any given day, about one in 31 hospital patients has at least one healthcare-associated infection. Common types include surgical site infections, catheter-associated urinary tract infections, and central line-associated bloodstream infections (sepsis). These infections can complicate a patient's recovery, prolong their hospital stay, and can even be fatal.

7. Failure to Treat and Premature Discharge

Sometimes, a doctor makes the right diagnosis but then fails to provide the appropriate treatment in a timely manner. This "failure to treat" can happen for many reasons—a doctor may not take a patient's complaints seriously, or a busy emergency room may overlook a critical test result.

Similarly, discharging a patient from the hospital too soon can be extremely dangerous. This often happens when hospitals are overcrowded or when insurance pressures dictate the length of stay. A patient who is sent home before they are medically stable is at a high risk of relapse or developing a serious complication that could have been managed in the hospital, forcing them to be readmitted in a much worse condition.

What to Do When You Suspect a Medical Error Has Harmed You

Feeling that your trust in a medical provider has been broken can be an isolating experience. If you are recovering at home and suspect that a medical error contributed to your injury or a loved one's condition, there are steps you can take to begin seeking clarity.

  • Request Your Medical Records: You have a right to a complete copy of your medical records from the hospital, clinic, and any doctors involved in your care. These documents are a crucial record of your treatment.
  • Seek a Second Medical Opinion: If your health is not improving or you have concerns about your diagnosis, getting an opinion from an independent doctor is always a good idea. This can help confirm your diagnosis and ensure you are on the right treatment path.
  • Keep a Detailed Journal: Write down everything you remember about your treatment. Note your symptoms, the dates of appointments, conversations you had with medical staff, and how your injury has impacted your daily life.

Taking these proactive steps can help you feel a sense of control and provide you with the information needed to better understand what happened.

Top Medical Error FAQs

We understand you may have many more questions about this complex and sensitive topic. Here are answers to some common concerns.

How can I prove a medical error caused my injury?

Proving that a medical error led to an injury typically involves a detailed review of medical records by other medical professionals. These professionals can help determine if the care you received fell below the accepted standard and if that deviation directly caused the harm you suffered.

Is there a time limit for taking action after a medical error in New York?

Yes, New York has a specific time limit, known as the "statute of limitations," for filing a medical malpractice claim. This deadline can be complex and depends on several factors, including the type of facility and the date the error was discovered. Because these time limits are strict, it is important to understand your rights as soon as possible.

What is the difference between a medical error and medical malpractice?

A medical error is a preventable mistake in a healthcare setting. It becomes medical malpractice when that error is a result of a healthcare provider's negligence (a failure to follow the standard of care) and directly causes significant harm to the patient. Not all errors rise to the level of malpractice.

Can a hospital be held responsible for a doctor's mistake?

In many situations, yes. Hospitals can be held responsible for the negligence of their employees, such as nurses or technicians. They may also be held accountable for a doctor’s error under certain circumstances, such as if the hospital failed to properly vet the doctor’s credentials or was negligent in its own policies and procedures.

What kind of compensation can be sought in a medical malpractice case?

Compensation is intended to help a person who was harmed recover the losses they have suffered. This can include the costs of past and future medical care, lost wages from being unable to work, and compensation for pain, suffering, and the loss of enjoyment of life caused by the injury.

A Team That Fights for Your Future

Attorney Pablo A.Sosa
Pablo A. Sosa - Medical Malpractice Lawyer

The attorneys at Queller Fisher are dedicated to providing compassionate and determined advocacy for those harmed by medical negligence. We understand that you are not a case file; you are a person whose life has been turned upside down. We intentionally maintain a low volume of cases to ensure every client receives the personal attention and meticulous preparation their situation deserves. With decades of combined experience, our respected team has a deep understanding of these complex matters and is committed to holding negligent parties accountable.

If you or a loved one has suffered a significant injury and you believe a medical error may be to blame, contact us today at (212) 406-1700 or through our online form. We offer a free, confidential consultation to listen to your story, answer your questions, and help you understand your options. Let us be your pillar of support in the fight for justice and the restoration of your life.

Schedule a Free Case Evaluation