Have you ever found yourself in an emergency room waiting area — watching the steady stream of people arriving through the doors, some clearly in acute distress, others looking uncertain about whether their situation genuinely warranted the visit — and wondered what the most common reasons are that bring people to emergency departments every day? Emergency rooms are the healthcare system’s safety net — open around the clock, legally required to evaluate every patient regardless of their ability to pay, and staffed to handle everything from a minor cut to a cardiac arrest. This blog examines the 10 most common reasons people visit emergency rooms—drawing on current epidemiological data to provide an honest, medically grounded picture of what emergency departments actually see and treat.
Table of Contents
Important medical disclaimer: This blog is written for informational and educational purposes only and does not constitute medical advice. If you are experiencing a medical emergency, call your local emergency services immediately. Always consult a qualified healthcare provider for personal medical concerns.
The Scale of Emergency Care in America
Before examining the specific conditions, the broader context is significant. The United States reported 140 million emergency department visits in 2021, equating to an overall rate of 43 visits per 100 people. Around 30 percent of these visits are related to injuries. An estimated 47 emergency department visits per 100 people occurred in 2022, with the ED visit rate highest for infants under age 1, followed by adults age 75 years and over.
These numbers reflect not merely a healthcare system under pressure but also a specific pattern of healthcare access — emergency departments serving as the safety net for conditions that range from genuinely life-threatening to those that could have been addressed by primary care if it had been more accessible, more affordable, or more timely.
1. Abdominal and Pelvic Pain
Abdominal pain is consistently the single most common reason for emergency room visits in the United States — accounting for a larger share of ED presentations than any other symptom category. Abdominal pain, chest pain, and shortness of breath lead ER visits.
The prevalence of abdominal pain as an ED presentation reflects both its frequency and its diagnostic urgency — abdominal pain is one of the most symptomatically diverse presentations in medicine, encompassing conditions ranging from the mild and self-limiting to the immediately life-threatening. Appendicitis, gallbladder disease, kidney stones, intestinal obstruction, ectopic pregnancy, aortic aneurysm, and dozens of other conditions can present as abdominal pain—and distinguishing between them requires the diagnostic imaging, laboratory testing, and clinical expertise that emergency departments provide.
The diagnostic challenge of abdominal pain is one of the reasons it generates such a high volume of emergency visits — patients presenting with significant abdominal pain frequently cannot know whether they are experiencing something manageable or something requiring urgent surgical intervention, and the consequences of delay for conditions like appendicitis or aortic aneurysms are severe enough that erring toward emergency evaluation is clinically prudent.
2. Chest Pain
Chest pain is the second most common reason for emergency room visits — and its prevalence reflects both the genuine frequency of the symptom and the specific anxiety it generates, because chest pain is the presenting symptom of myocardial infarction and other immediately life-threatening conditions that most patients are acutely aware of.
The clinical reality of chest pain presentations is that the majority are not cardiac in origin — musculoskeletal chest pain, gastro-oesophageal reflux, anxiety, and respiratory causes collectively account for a large proportion of chest pain presentations — but the subset that represents acute coronary syndrome, pulmonary embolism, aortic dissection, or other immediately dangerous conditions is large enough that every presentation requires systematic evaluation to exclude these diagnoses before a benign cause can be confirmed.
The specific diagnostic urgency of chest pain — combined with the medicolegal and clinical imperative to not miss a cardiac event — makes it among the most resource-intensive emergency presentations and one of the most important drivers of emergency department utilisation. The widespread public awareness of cardiac chest pain symptoms, while clinically valuable in driving appropriate emergency-seeking behaviour, also produces a volume of non-cardiac presentations that the emergency system must evaluate systematically.
3. Shortness of Breath and Respiratory Conditions
Respiratory presentations — encompassing shortness of breath, difficulty breathing, cough, wheezing, and the acute exacerbations of chronic respiratory conditions including asthma and chronic obstructive pulmonary disease — represent the third major category of emergency department visits. Cough is a frequent reason for ER visits, representing 3.3% of cases, often signalling respiratory infections, bronchitis, or exacerbations of chronic conditions like asthma and COPD.
The respiratory category of ED presentations encompasses an exceptionally broad range of severity — from the acute asthma attack that requires bronchodilator treatment and can be resolved within hours to the acute respiratory failure requiring mechanical ventilation and intensive care. Between these extremes lie the pneumonias, the pulmonary emboli, the pleural effusions, the pneumothoraces, and the decompensated heart failure presentations that collectively occupy a large share of emergency department clinical activity.
During the COVID-19 pandemic, ER visits related to respiratory distress surged, highlighting the importance of ER departments as frontline providers of care for respiratory emergencies. This pandemic-related surge both revealed and amplified the central importance of respiratory presentations in emergency medicine — and the ongoing burden of respiratory illness, including influenza, RSV, and COVID-19, continues to generate substantial emergency department utilisation particularly in winter months.
4. Injuries From Falls
Falls are among the most common injury mechanisms producing emergency department visits — representing a major public health burden across the adult population and particularly among the elderly. Around 30 percent of emergency room visits relate to injuries, and falls constitute the largest single category within that injury group.
Fall-related injuries span an enormous range of severity — from minor soft tissue injuries requiring only wound care and analgesia to the hip fractures, subdural haematomas, and vertebral fractures that make falls the leading cause of injury-related death among adults over 65. The specific danger of falls in the elderly reflects the convergence of multiple risk factors — reduced bone density that makes fractures more likely at lower impact forces, reduced balance and muscle strength that makes falls more frequent, anticoagulant medication use that makes the consequences of head injury more severe, and the reduced physiological reserve that makes recovery from major injury more challenging.
Per epidemiological data on fall-related emergency visits, the incidence increases sharply with age — with adults over 65 representing a disproportionate share of fall presentations and an even more disproportionate share of fall-related hospitalisations and deaths. The prevention of falls in the elderly is one of the most important and most evidence-supported public health interventions available, with home safety assessment, exercise programmes for balance and strength, medication review, and vision correction all demonstrating documented effectiveness in reducing fall incidence.
5. Fever
Fever — whether as a primary presenting complaint or as a component of a broader acute illness presentation — is one of the most common reasons for emergency department visits across all age groups, with particular prominence in paediatric presentations. CDC notes that fever can be an early indicator of various conditions, including bacterial infections, viral illnesses like influenza, and COVID-19. Parents are often inclined to seek immediate care for children with high or prolonged fevers due to potential complications, highlighting the ER’s role in managing paediatric emergencies.
The clinical significance of fever varies enormously depending on the patient’s age, the fever’s magnitude and trajectory, and the associated clinical features. In neonates and young infants, even a modest fever requires systematic evaluation because the immune system’s immaturity makes serious bacterial infection — meningitis, sepsis, urinary tract infection — a genuine and dangerous possibility that cannot be reliably excluded without laboratory investigation. In older children and adults, the threshold for emergency evaluation is higher, but fever combined with specific alarming features — severe headache and neck stiffness suggesting meningitis, respiratory distress, altered consciousness, immunosuppression — appropriately triggers emergency-seeking behaviour.
The significant volume of fever presentations that do not represent serious bacterial or viral illness — the common colds, the self-limiting viral syndromes, the minor infections managed with antipyretics and supportive care — reflects the pattern of primary care access in the United States, where the difficulty of obtaining timely appointments with primary care physicians frequently directs patients whose conditions could be managed in that setting toward the emergency department instead.
6. Mental Health Crises — Anxiety, Depression, and Psychiatric Emergencies
Mental health presentations have become one of the fastest-growing categories of emergency department visits — reflecting both the genuine increase in mental health challenge across the population and the severe shortage of accessible outpatient mental health services that directs patients in mental health crisis toward the emergency department as the only available point of access.
Mental health is a rising concern in ER visits due to anxiety, depression, and other mental health issues. Visit rates for adolescents and adults with mental health disorders and substance use disorders at health centres were higher than visits for substance use disorders alone across all age groups.
The mental health presentations that most commonly drive emergency department visits include acute suicidality — the assessment and management of which requires immediate clinical attention that cannot be safely deferred to outpatient settings — acute psychosis, severe anxiety and panic disorders, major depressive episodes requiring urgent intervention, and the psychiatric complications of substance use disorders including intoxication, withdrawal, and the mental health consequences of chronic substance dependence.
The emergency department is structurally poorly suited to the management of many mental health presentations — it is designed for acute physical illness assessment and treatment, not for the extended psychiatric evaluation, the therapeutic relationship, and the community connection that effective mental health care requires. The growth of emergency mental health presentations reflects the failure of the broader mental health system to provide accessible, timely, affordable outpatient care — a systemic problem whose consequences are felt most acutely in emergency departments that were not designed to be the primary point of mental healthcare access.
7. Back Pain
Back pain is one of the most prevalent symptoms in the adult population and one of the most common reasons for emergency department visits — generating a large volume of presentations that range from the genuinely alarming to the almost universally benign but indistinguishable without clinical assessment.
The clinical challenge of back pain in the emergency setting is the identification of the small but important minority of presentations that represent conditions requiring urgent intervention — epidural abscess, cauda equina syndrome, vertebral fracture, aortic aneurysm presenting as back pain, and spinal cord compression from malignancy or infection — within the much larger majority that represent the mechanical back pain and muscle strain whose management is supportive and whose natural history is favourable.
The specific red flags that distinguish urgent from non-urgent back pain presentations — new onset in patients over 50, history of cancer, fever, neurological symptoms including bowel or bladder dysfunction, severe trauma history — guide the selective use of emergency imaging and intervention. For the majority of back pain presentations without these features, emergency department management is supportive — analgesia, muscle relaxants, education, and outpatient follow-up — with the principal clinical contribution being the exclusion of the dangerous minority of presentations.
8. Headache
Headache is both an extremely common symptom in the general population and an important emergency department presentation — because the subset of headaches that represents subarachnoid haemorrhage, meningitis, hypertensive emergency, or other dangerous conditions requires urgent identification and treatment. Headaches led to 2.8% of ER visits, reflecting concerns over sudden, severe, or persistent head pain that might indicate conditions such as migraines, tension headaches, or, in severe cases, neurological issues like aneurysms or meningitis. Migraine sufferers, in particular, may seek care for pain relief when over-the-counter treatments fail.
The thunderclap headache — the sudden onset severe headache that reaches maximal intensity within seconds to minutes — is the presentation most urgently requiring emergency evaluation, because subarachnoid haemorrhage classically presents in this way and the mortality of missed subarachnoid haemorrhage is substantial. The emergency evaluation of thunderclap headache typically includes CT brain imaging and, if negative, lumbar puncture to detect the xanthochromia that indicates subarachnoid blood.
The larger volume of headache presentations — migraine, tension-type headache, and other benign primary headache disorders — represents patients seeking acute treatment for pain that is not responding to available analgesia, or who are uncertain whether their headache pattern represents something dangerous. Emergency department management of migraine typically includes parenteral antiemetics and analgesics that provide more rapid and more complete relief than oral medications.
9. Urinary Tract Symptoms and Kidney Stones
Urinary tract infections and kidney stones collectively generate a substantial volume of emergency department visits — reflecting both the frequency of these conditions in the general population and the specific symptom severity that drives emergency-seeking behaviour.
Kidney stones — the passage of calcified mineral deposits through the urinary tract — produce one of the most severe pain presentations encountered in any clinical setting, described by patients as among the worst pain they have ever experienced. The acute renal colic of kidney stone passage — typically a severe, cramping flank pain that radiates to the groin, accompanied by nausea and often haematuria — is both a genuinely urgent clinical situation requiring effective analgesia and a presentation whose diagnosis and management is well-suited to emergency department capabilities.
Urinary tract infections generate a different but equally significant pattern of emergency presentations — ranging from the uncomplicated lower urinary tract infections of young women whose symptoms are discomforting enough to drive emergency visits when primary care is unavailable, to the complicated urinary tract infections and pyelonephritis of older adults and immunocompromised patients whose severity warrants emergency evaluation and parenteral antibiotic treatment.
10. Dental and Tooth Disorders
Tooth disorders accounted for an annual average of 1,944,000 emergency department visits during 2020–2022, or 59.4 visits per 10,000 people. Dental pain is one of the most common and most avoidable reasons for emergency department utilisation — driven primarily by the absence of accessible, affordable dental care for a large proportion of the population rather than by the intrinsic severity of the conditions involved.
On average, 34 million school hours are lost each year because of unplanned emergency dental care, and over $45 billion in US productivity is lost each year due to untreated dental disease. Oral disease can cause pain and infection, which lead to unplanned visits for emergency care, especially among those who lack access to routine dental care.
The largest percentage of ED visits for tooth disorders was made by adults ages 25–34 (29.2%). The majority of visits for tooth disorders had Medicaid as the primary expected source of payment. This demographic profile reveals the dental emergency visit as primarily a consequence of healthcare access failure — patients who cannot afford or cannot access routine dental care present to emergency departments when dental pain becomes intolerable, receiving analgesics and antibiotics that temporarily manage symptoms without addressing the underlying dental pathology that only dental treatment can resolve.
Opioids as the sole pain-relief drug given or prescribed at ED tooth disorder visits decreased from 38.1% in 2014–2016 to 16.5% in 2020–2022 — reflecting the significant shift in emergency opioid prescribing practice following the recognition of the opioid epidemic’s contribution to overdose mortality.
Key Takeaways
The 10 most common reasons for emergency room visits — abdominal pain, chest pain, respiratory conditions, fall injuries, fever, mental health crises, back pain, headache, urinary conditions, and dental disorders — collectively reveal a picture of the emergency department as a remarkably versatile institution simultaneously addressing acute surgical emergencies, chronic disease exacerbations, mental health crises, injury care, and the consequences of healthcare access failure in a single clinical environment.
The trend underscores challenges in accessing primary care and addressing underlying health conditions. Understanding the trends and patterns in ED utilisation is essential for informing healthcare policy and practice. Many of the most common emergency presentations — dental emergencies, fever in adults without alarming features, minor injuries, non-urgent back pain, and uncomplicated urinary tract infections — reflect the use of emergency departments as primary care substitutes by populations who lack access to timely, affordable primary care.
Per public health research on emergency department utilisation and healthcare access, addressing the primary care access gap — through expanded community health centre funding, telehealth provision, urgent care infrastructure, and healthcare coverage expansion — has greater potential to reduce emergency department overcrowding and improve patient experience than any operational changes within emergency departments themselves.
The emergency room is at its best when it is doing what it was designed to do — providing immediate, expert evaluation and treatment for conditions that cannot safely wait. Understanding what most commonly brings people through its doors is the first step toward building the healthcare system that reserves it for exactly those moments.
