Common Medical Errors Patients Should Know About
Medical errors aren’t always obvious when they happen. An older patient or caregiver may not realize something went wrong until another doctor questions the original diagnosis or discovers that an abnormal test result was never addressed. By then, the delay may have affected the patient’s health and left the family wondering whether the harm could have been prevented.
Medical errors contribute to more than 250,000 deaths each year, according to a Johns Hopkins analysis, representing approximately 9.5% of annual deaths in the United States. While these figures are estimates, they illustrate how serious failures in medical care can be.
Some complications occur despite appropriate care, and not every medical error supports a malpractice claim. Recognizing where care commonly breaks down can help older adults and their caregivers know which questions to ask and when an experience deserves a closer look.
Why Medical Errors Happen
When a medical mistake reaches a patient, it usually reflects more than one failed safeguard. Short staffing increases workloads and makes it harder to give each patient enough attention. Inadequate training can leave providers unprepared for unusual or rapidly changing situations. During a rushed handoff, critical information about a patient’s condition or treatment can also be lost.
Decisions made far from the bedside affect patient safety, too. When productivity targets, rapid turnover, or cost-cutting take priority over careful evaluation, health care facilities create conditions in which mistakes are more likely.
According to the World Health Organization, more than half of patient harm in health care is preventable. The organization also explains that most harmful mistakes arise from failures in systems or processes rather than the actions of one worker. That doesn’t excuse individual negligence. It shows why understanding what happened may require looking beyond the treating provider to examine how the facility organized and delivered care.
Common Medical Errors
Safe medical care depends on providers having the right information and acting on it at the right time. When that process breaks down, the harm may be immediate or remain hidden until the patient’s condition worsens. At any point in a patient’s care, even a seemingly small oversight can alter the course of their health.
1. Misdiagnosis or Delayed Diagnosis
Few errors redirect care as completely as a misdiagnosis or delayed diagnosis. A serious condition may be mistaken for a benign illness, sending treatment in the wrong direction. In emergencies, symptoms of a heart attack or stroke can also be attributed to something less urgent.
The harm comes from lost time. As the actual condition progresses without treatment, it can become harder to manage. For time-sensitive emergencies, that delay can cause permanent harm.
The Centers for Disease Control and Prevention’s diagnostic excellence framework encourages hospitals to improve how diagnoses are made and how test results are communicated and addressed. Stronger systems can help providers catch missed, delayed, or incorrect diagnoses before patients suffer further harm.
2. Medication Errors
A prescription must remain accurate from the moment a provider selects a drug until the patient receives each dose. If an allergy or potential interaction is missed at the start, the prescription itself may be unsafe. Later, a pharmacy might dispense the wrong medication or strength. An incorrect dose can also be administered during treatment.
These errors can cause a dangerous reaction or leave the patient’s condition untreated. In the most serious cases, the result is fatal. The U.S. Food and Drug Administration’s Center for Drug Evaluation and Research receives more than 100,000 medication error reports each year. That figure includes reports about actual errors and circumstances that could cause one, not 100,000 confirmed injuries or deaths.
3. Surgical Errors Involving the Wrong Site, Patient, or Procedure
Surgery is built around verification. Before the first incision, the medical team should know exactly who is on the table and confirm that the planned procedure matches the patient’s consent and the correct body site.
When those safeguards fail, a patient might undergo an operation intended for someone else. A surgeon could also operate on the wrong part of the body or perform an entirely different procedure. These mistakes are classified as “never events” by the Agency for Healthcare Research and Quality because they should never occur and point to serious underlying safety failures.
Surgical errors of this kind can provide powerful evidence that the standard of care was violated. A claim must still establish who was responsible and how the mistake harmed the patient.
4. Failure to Order, Perform, or Act on Lab Tests
A test only helps when its result reaches someone prepared to act on it. The process can break down before a sample is collected if a provider overlooks a necessary test or an ordered study is never completed. Even an accurate result can be misread, ignored, or left in the patient’s record without follow-up.
For the patient, the underlying condition remains undiagnosed as valuable treatment time passes. The Agency for Healthcare Research and Quality has linked failures to act on abnormal laboratory and radiology results with missed or delayed diagnoses.
Not every abnormal finding calls for the same response. Clinically significant results should be reviewed and addressed with urgency that reflects the risk to the patient. A facility’s failure to maintain a reliable system for handling those results may point to hospital negligence.
5. Retained Objects After Surgery
Nothing used during an operation should remain inside the patient unless it was intentionally placed there. Yet a sponge, broken instrument, or clamp can be left behind when the surgical team miscounts equipment or fails to resolve a discrepancy before closing the incision.
Retained surgical objects are also classified as never events. Item counts are intended to prevent these mistakes. If the totals don’t match, the team should locate the missing material before the procedure ends.
The Joint Commission’s 2024 sentinel event review included 119 voluntary reports involving objects unintentionally retained after surgery or another invasive procedure. Sponges accounted for 40 reports, while instrument fragments appeared in 20. Thirteen instruments were involved, such as clamps or retractors.
A retained object can cause infection or internal injury and may require another operation. Those circumstances can provide strong evidence of medical negligence.
6. Surgical Technique Errors and Avoidable Complications
Complications and surgical errors aren’t the same. A known complication can occur even when a surgeon provides appropriate care. An error involves a preventable failure in how the operation is planned or performed.
Poor technique can damage nearby organs or nerves, and a lapse in sterile practice can lead to infection. If an injury isn’t recognized quickly, the patient may be left with chronic pain, impaired function, disfigurement, or permanent disability. Some surgical errors are fatal.
A complication may support a doctor negligence claim when the surgeon’s conduct falls below the accepted standard of care and directly causes harm. Determining whether that happened generally requires a careful review of the patient’s records and the circumstances surrounding the operation.
7. Hospital-Acquired Infections and Sepsis
An infection acquired during hospital care can turn recovery into a second medical crisis. Some infections spread through contaminated equipment or lapses in sanitation. Others take hold when a surgical wound isn’t properly cleaned or monitored.
A Centers for Disease Control and Prevention survey found that 2.6% of hospitalized patients had at least one health care-associated infection on a given day in 2023. That represents approximately 1 in 38 patients and an estimated 518,000 infections in U.S. acute care hospitals.
When an infection triggers the body’s extreme response, the patient can develop sepsis. The CDC identifies sepsis as a leading cause of hospital mortality, contributing to more than one-third of hospital deaths. Fast recognition and treatment are critical.
Not every hospital-acquired infection is preventable. However, poor sanitation, improper wound care, or a delayed response to symptoms can point to a breakdown in accepted safety protocols.
8. Premature Discharge
Discharge shifts much of the responsibility for care from the hospital to the patient and their family. Before that happens, the patient should be medically stable and have a realistic plan for recovery at home.
Sending someone home too soon after surgery can leave complications unmonitored. Inadequate pain control or the absence of follow-up care may make the situation worse. In a widely cited study, nearly 1 in 5 patients experienced an adverse event within three weeks of discharge, according to the Agency for Healthcare Research and Quality. That finding doesn’t mean every adverse event resulted from a premature discharge, but it shows how vulnerable patients can be during this transition.
A hospital may be liable when the patient’s condition indicated they weren’t medically ready to leave and the premature release caused additional harm.
9. Failure to Follow Up or Communicate
Follow-up connects one stage of medical care to the next. When no one takes clear responsibility for that connection, important information can disappear between providers or never reach the patient.
A doctor might not respond when a patient reports worsening symptoms. During a handoff, the next provider may receive an incomplete picture of recent treatment or overlook care that is still pending. Patients can also leave the hospital without clear instructions about when to seek help.
Medical providers are expected to communicate clinically significant information and arrange appropriate follow-up. When an avoidable breakdown delays treatment and causes harm, it may support a malpractice claim.
10. Unnecessary Surgery or Overtreatment
Every test or procedure should address a legitimate clinical need. When treatment offers no reasonable benefit, the patient assumes medical risk without a sound justification.
An unnecessary spinal or cardiac procedure exposes a patient to the risks of surgery and recovery. Excessive testing can also produce false-positive findings that lead to further interventions the patient never needed.
A 2017 survey asked 2,106 physicians to estimate the extent to which medical care was unnecessary. Their median estimate was 20.6%. When asked what contributes to overtreatment, 84.7% selected fear of malpractice. Patient pressure was cited by 59%, and 38.2% pointed to difficulty accessing medical records.
These findings reflect physicians’ perceptions, not a measured share of all U.S. care. Overtreatment may constitute malpractice when no reasonably careful provider would have recommended it, and the patient is harmed as a result.
What Caregivers Can Watch for During an Older Adult’s Medical Care
Older adults may take several medications and see different providers, making it easier for important information to get lost. With the patient’s permission, a caregiver can help by:
- Keeping one medication list: Record prescriptions, over-the-counter medicines, supplements, dosages, and allergies.
- Tracking tests and referrals: Note when results should arrive and follow up if they don’t.
- Watching for changes: Report new or worsening symptoms and treatment that doesn’t seem to be helping.
- Reviewing discharge instructions: Confirm medication changes, pending results, follow-up care, and warning signs.
- Questioning inconsistencies: Ask for clarification when providers give conflicting directions or appear to have incomplete information.
Caregivers aren’t responsible for preventing provider errors. Their observations can, however, help expose communication gaps before further harm occurs.
Could What Happened Be Medical Malpractice?
A poor outcome doesn’t always mean malpractice occurred. Doctors sometimes make reasonable treatment decisions that don’t work as hoped. A claim requires four elements: a duty of care, a breach of that duty, causation, and damages.
The central question is whether the care fell below the accepted standard for a reasonably competent provider in the same field. New York courts require proof that the provider departed from accepted medical practice and caused the patient’s injury.
For example, failing to act on an abnormal test result could be malpractice if the delay allowed a condition to worsen. It isn’t always easy to tell whether care crossed that line. Our New York medical malpractice attorneys can review what happened and help you understand your options.
What to Do If You Suspect a Medical Error
Realizing that something may have gone wrong with your care or a loved one’s care can be unsettling. You don’t need to determine whether it was malpractice before protecting the patient’s health and preserving what happened.
- Get independent medical care: Another qualified physician can address immediate concerns and provide a second opinion.
- Request your medical records: New York law gives patients the right to access their records from the hospitals and providers involved.
- Create a written timeline: Record relevant dates, provider names, conversations, and changes in your condition while the details are fresh.
- Report your concerns: Contact the hospital’s patient advocate or risk management department and keep copies of any correspondence.
- Be careful what you sign or say: Speak with a medical malpractice attorney before signing a liability release, accepting a settlement, or giving a recorded statement to an insurer.
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