If you’ve searched for incidence vs incidents, you’re probably wondering whether these words mean the same thing or if one is the correct choice in a particular sentence.
Although they look similar and share the same root, incidence and incidents are not interchangeable.
The confusion often arises because both words relate to events or occurrences. However, they serve different purposes in English. Incidence refers to the rate, frequency, or occurrence of something, especially in statistics, medicine, research, and formal writing.
Incidents, on the other hand, is simply the plural form of incident, meaning individual events or occurrences, often unexpected or noteworthy.
Using the wrong word can change the meaning of your sentence and make your writing less precise, particularly in academic papers, business reports, healthcare documents, and news articles.
In this guide, you’ll learn the exact difference between incidence vs incidents, discover when each word is appropriate, explore grammar rules, and see plenty of real-world examples so you can use both confidently.
Quick Answer
Both words are correct, but they have different meanings.
- Incidence is a singular noun that refers to the rate, frequency, or occurrence of something.
- Incidents is the plural form of incident, meaning multiple events or occurrences.
- Use incidence when discussing statistics, trends, or how often something happens.
- Use incidents when referring to two or more specific events.
Example:
✅ The incidence of diabetes has increased over the last decade.
✅ Several security incidents were reported during the conference.
Incidence vs Incidents Comparison Table
| Feature | Incidence | Incidents |
|---|---|---|
| Meaning | The rate, frequency, or occurrence of something | More than one incident or event |
| Part of Speech | Noun (singular) | Plural noun |
| Pronunciation | /ˈɪn.sɪ.dəns/ | /ˈɪn.sɪ.dənts/ |
| Refers To | Frequency or level of occurrence | Individual events |
| Number | Singular | Plural |
| Common Contexts | Medicine, statistics, research, public health, epidemiology | News, workplaces, schools, businesses, daily life |
| Formality | Mostly formal and technical | Used in both formal and everyday English |
| Academic Writing | Very common | Common when describing events |
| Business Writing | Used for rates and trends | Used for reports of specific events |
| Medical Writing | Extremely common | Used for patient or hospital events |
| Typical Collocations | incidence rate, disease incidence, incidence of crime, incidence of poverty | security incidents, workplace incidents, traffic incidents, cyber incidents |
| Answers the Question | How often does something occur? | What events happened? |
| Can Replace the Other? | No | No |
| Common Mistake | Using it to mean individual events | Using it instead of frequency or rate |
| Example | The incidence of asthma is increasing. | Three workplace incidents occurred this week. |
| Remember Easily | Think frequency | Think events |
Understanding the Word “Incidence”
Definition
Incidence is a singular noun that describes the rate, frequency, or occurrence of something within a population, place, or period of time.
Rather than referring to one specific event, it focuses on how common something is.
This meaning is especially important in fields such as:
- Medicine
- Public health
- Epidemiology
- Statistics
- Sociology
- Economics
- Criminology
- Academic research
For example:
- The incidence of obesity has risen over the last twenty years.
This sentence discusses how frequently obesity occurs, not individual cases.
Origin of “Incidence”
The word incidence comes from the Latin verb incidere, meaning to fall upon or to happen. Over time, English adopted the term to describe the occurrence or frequency of an event, especially in scientific and statistical contexts.
Today, its meaning has become highly specialized and is widely used in research, healthcare, and data analysis.
Grammar of “Incidence”
Understanding the grammar of incidence makes it easier to use correctly.
- Part of speech: Noun
- Countability: Usually uncountable when referring to frequency
- Number: Singular
- Common article: the
- Often followed by of
Examples:
- the incidence of cancer
- the incidence of crime
- the incidence of unemployment
- the incidence of poverty
Notice that incidence is rarely pluralized in everyday writing. While incidences exists, it usually refers to separate occurrences of the concept in highly specialized contexts and is uncommon. In most cases, writers mean incidents instead.
Pronunciation of “Incidence”
IPA (UK & US):
/ˈɪn.sɪ.dəns/
It is pronounced:
IN-si-dence
The final sound is -dence, not -dents.
When to Use “Incidence”
Use incidence whenever you’re talking about:
- How often something happens
- The frequency of a condition
- Statistical occurrence
- Rates within a population
- Trends over time
- Research findings
Think of incidence as answering the question:
“How common is it?”
Common Situations Where “Incidence” Is Used
Medicine
Doctors frequently discuss disease incidence.
Examples:
- The incidence of malaria has declined.
- Researchers measured the incidence of heart disease.
- The annual incidence of influenza varies.
Public Health
Health organizations track incidence to understand disease patterns.
Examples:
- The incidence of smoking among teenagers has decreased.
- Vaccination programs reduced the incidence of infections.
- Officials monitor the incidence of new cases every month.
Statistics
Researchers use incidence when analyzing data.
Examples:
- The survey measured the incidence of workplace stress.
- Scientists compared the incidence across age groups.
- The incidence was higher in urban areas.
Crime Reports
Government agencies often report crime incidence.
Examples:
- The incidence of theft increased last year.
- Police studied the incidence of violent crime.
- The report examined the incidence of fraud nationwide.
Business
Businesses also use incidence when discussing trends.
Examples:
- The incidence of customer complaints has fallen.
- Managers reviewed the incidence of production errors.
- The company reduced the incidence of workplace injuries.
Academic Use of “Incidence”
Academic writing frequently uses incidence because it focuses on measurable occurrence rather than individual events.
Examples:
- The incidence of diabetes differs across regions.
- Researchers examined the incidence of depression among adolescents.
- The study analyzed the incidence of internet addiction.
This word is especially common in:
- Research papers
- Medical journals
- Government publications
- University assignments
- Scientific reports
Professional Use of “Incidence”
Professionals often rely on incidence when discussing patterns, trends, and measurable outcomes.
Examples include:
- Healthcare professionals monitor disease incidence.
- Insurance analysts examine the incidence of claims.
- HR departments track the incidence of workplace accidents.
- Quality control teams evaluate the incidence of product defects.
Using incidence in these contexts communicates that you’re referring to how often something occurs, not the events themselves.
Everyday Use of “Incidence”
Although incidence is more common in formal writing, it can also appear in everyday discussions when talking about trends.
Examples:
- The incidence of seasonal allergies seems higher this year.
- The incidence of phone scams has increased recently.
- People are concerned about the incidence of online fraud.
In casual conversation, however, many speakers simply say:
- The number of cases has increased.
- This problem is becoming more common.
These alternatives are often more natural outside technical or academic contexts.
Understanding the Word “Incidents”
Definition
Incidents is the plural form of the noun incident. It refers to two or more individual events, occurrences, or situations, especially those that are unusual, unexpected, important, or worth reporting.
Unlike incidence, which measures how often something happens, incidents refers to the actual events themselves.
Think of incidents as answering the question:
“What happened?”
For example:
- Several security incidents were reported last month.
- The school investigated three bullying incidents.
In both sentences, incidents refers to specific events, not their frequency.
Origin of “Incidents”
The noun incident comes from the Latin incidere, meaning to happen or to occur. It entered English through Old French and has long been used to describe an event or occurrence.
Adding -s simply makes it plural:
- incident = one event
- incidents = two or more events
Grammar of “Incidents”
Understanding the grammar helps prevent one of the most common mistakes.
| Grammar Feature | Incidents |
|---|---|
| Part of Speech | Plural noun |
| Number | Plural |
| Countable | Yes |
| Article | Usually used without “a/an” because it is plural |
| Refers To | Multiple events or occurrences |
Examples:
- Several incidents occurred yesterday.
- The company reported five incidents.
- Police investigated multiple incidents.
Pronunciation of “Incidents”
IPA (UK & US):
/ˈɪn.sɪ.dənts/
Pronounced as:
IN-si-dents
Notice the ending:
- Incidence → -dence
- Incidents → -dents
Although they sound similar, the final syllable is different.
When to Use “Incidents”
Use incidents whenever you’re referring to:
- Specific events
- Accidents
- Security issues
- Workplace reports
- School events
- Police reports
- Customer complaints
- Technical problems
- News stories
Examples:
- Four workplace incidents were reported.
- Police responded to several traffic incidents.
- The airline investigated two safety incidents.
Common Situations Where “Incidents” Is Used
Workplace
Companies record incidents for safety and compliance.
Examples:
- Three safety incidents occurred this quarter.
- All workplace incidents must be reported immediately.
- Managers reviewed recent incidents during the meeting.
Schools
Educational institutions document incidents involving students.
Examples:
- The principal investigated several bullying incidents.
- Parents were informed about the incidents.
- The school introduced new policies after repeated incidents.
Security
Security teams track incidents to improve protection.
Examples:
- Cybersecurity incidents increased this year.
- Security incidents were reported overnight.
- Every incident is logged for investigation.
News Reporting
Journalists often use incidents to describe noteworthy events.
Examples:
- Police confirmed two separate incidents.
- Several incidents disrupted traffic.
- Emergency services responded to multiple incidents.
Customer Service
Businesses also refer to customer-related events as incidents.
Examples:
- Support staff resolved all reported incidents.
- Customer incidents declined after the software update.
- Every incident receives a case number.
Academic Use of “Incidents”
Although less technical than incidence, incidents appears in academic writing when discussing documented events.
Examples:
- Researchers analyzed reported incidents of cyberbullying.
- The study examined classroom incidents over five years.
- Historical incidents were compared across regions.
Professional Use of “Incidents”
Many industries use incidents in official reports.
Examples include:
- Incident management
- Security incidents
- Workplace incidents
- Medical incidents
- Environmental incidents
- Network incidents
- IT incidents
- Aviation incidents
These phrases describe actual events, not rates or frequencies.
Everyday Use of “Incidents”
In everyday English, incidents is much more common than incidence.
Examples:
- There were several funny incidents during our trip.
- We haven’t had any incidents lately.
- Those incidents taught us valuable lessons.
People naturally use incidents when talking about things that happened.
Key Differences Between Incidence and Incidents
Although the words share the same root, they have different meanings and should not be used interchangeably.
- Incidence refers to the rate, frequency, or occurrence of something.
- Incidents refers to multiple individual events.
- Incidence is common in research, medicine, and statistics.
- Incidents is common in everyday English, business, schools, workplaces, and news reports.
- Incidence is usually associated with measurable trends.
- Incidents focuses on specific situations or events.
- Incidence is generally singular.
- Incidents is always plural.
- Replacing one with the other changes the meaning of a sentence.
Simple rule:
Incidence = frequency
Incidents = events
Grammar Explanation
Parts of Speech
| Word | Part of Speech |
|---|---|
| Incidence | Singular noun |
| Incidents | Plural noun |
Singular vs. Plural
- Incidence is a singular noun describing frequency.
- Incidents is the plural of incident.
Correct:
- The incidence of disease is rising.
- Several incidents occurred yesterday.
Incorrect:
- ❌ Several incidence occurred.
- ❌ The incidents of cancer is increasing. (Use incidence when referring to the rate.)
Countable vs. Uncountable
Incidence
Usually treated as an uncountable concept referring to occurrence or frequency.
Example:
- The incidence of obesity has increased.
Incidents
A countable plural noun.
Example:
- Five incidents were reported.
Common Sentence Patterns
Incidence
- the incidence of…
- high incidence of…
- low incidence of…
- incidence rate
- annual incidence
Incidents
- several incidents
- multiple incidents
- reported incidents
- security incidents
- workplace incidents
Articles
With incidence:
- the incidence of diabetes
- a high incidence of injuries
With incidents:
- several incidents
- many incidents
- two incidents
Agreement
Correct:
- The incidence is increasing.
- The incidents are under investigation.
Notice the verb agreement:
- Incidence → is
- Incidents → are
Real-Life Examples
Everyday Conversation
- The incidence of flu usually increases in winter.
- We haven’t had any serious incidents this month.
- The incidence of allergies seems higher this year.
- Several incidents delayed our vacation.
Business
- The company reduced the incidence of production defects.
- Managers reviewed all workplace incidents.
- The incidence of customer complaints has fallen.
- Recent security incidents prompted policy changes.
- Please review the reported incidents before tomorrow’s meeting.
- The incidence of billing errors has decreased significantly.
- We are investigating the incidents mentioned in your email.
- The report measures the annual incidence of software failures.
School
- Teachers recorded several classroom incidents.
- The incidence of absenteeism improved this semester.
- The school investigated bullying incidents.
- Researchers examined the incidence of reading difficulties.
Healthcare
- Doctors monitor the incidence of heart disease carefully.
- Hospitals reported several medication-related incidents.
- The incidence of infections declined after vaccination.
- Patient safety incidents are reviewed every week.
News
- Police responded to multiple traffic incidents.
- The incidence of unemployment increased last quarter.
- Emergency crews handled several weather-related incidents.
- Officials studied the incidence of crime in urban areas.
Technology
- The IT department resolved all network incidents.
- The incidence of cyberattacks has increased worldwide.
Academic Writing
- The study measured the incidence of asthma among children.
- Researchers documented incidents during field observations.
Social Media
- Several funny incidents happened during our road trip!
- The incidence of fake accounts continues to rise.
Common Collocations
Common Collocations with Incidence
- incidence of disease
- incidence rate
- annual incidence
- high incidence
- low incidence
- disease incidence
- incidence of cancer
- incidence of poverty
- incidence of crime
- incidence of infection
Common Collocations with Incidents
- security incidents
- workplace incidents
- traffic incidents
- safety incidents
- cyber incidents
- reported incidents
- serious incidents
- violent incidents
- customer service incidents
- medical incidents
Common Mistakes with Incidence vs Incidents
Because incidence and incidents look and sound similar, they’re often confused. The mistake usually happens when writers use one word in place of the other. Here’s how to avoid the most common errors.
| ❌ Incorrect | Why It’s Wrong | ✅ Correct |
|---|---|---|
| The incidents of diabetes is increasing. | Incidents means events, not frequency. | The incidence of diabetes is increasing. |
| The company reduced workplace incidence. | You’re referring to multiple events. | The company reduced workplace incidents. |
| Several incidence were reported yesterday. | Incidence is not the plural of incident. | Several incidents were reported yesterday. |
| Police investigated the incidence. | Police investigate events, not rates. | Police investigated the incident. |
| The hospital reported many incidence. | The plural noun should be incidents. | The hospital reported many incidents. |
| We tracked the incidents of heart disease over time. | This refers to frequency, so use incidence. | We tracked the incidence of heart disease over time. |
| The incidence are increasing. | Incidence is singular. | The incidence is increasing. |
| The incidents is under investigation. | Incidents is plural. | The incidents are under investigation. |
Tip: If you’re talking about how often something happens, choose incidence. If you’re talking about what happened, choose incident or incidents.
Memory Tricks
Simple memory tricks can help you remember the difference instantly.
Trick 1: Frequency vs. Events
- Incidence = Frequency
- Incidents = Events
Ask yourself:
- How often? → Incidence
- What happened? → Incidents
Trick 2: Think of Statistics
When you see charts, percentages, surveys, or research papers, you’ll almost always need incidence.
Example:
- Incidence of cancer
- Incidence rate
- Incidence of poverty
Trick 3: Think of Reports
Police reports, workplace reports, school reports, and news stories usually describe incidents.
Example:
- Security incidents
- Traffic incidents
- Workplace incidents
Trick 4: Look at the Verb
- Incidence is increasing.
- Incidents are increasing.
The verb often tells you which noun is correct.
Trick 5: One Measures, One Describes
- Incidence measures occurrence.
- Incidents describes occurrences.
That’s an easy way to remember the distinction.
Frequently Asked Questions (FAQs)
Is incidence the plural of incident?
No. Incidence is a different noun with a different meaning. The plural of incident is incidents.
What is the difference between incidence and incidents?
Incidence refers to the rate or frequency of something happening, while incidents refers to multiple individual events or occurrences.
Which word is used in medical writing?
Medical and scientific writing most often uses incidence when discussing the occurrence of diseases, conditions, or health-related trends.
Example:
- The incidence of diabetes has increased.
Can I use incidence instead of incidents?
No. Although the words are related, they are not interchangeable. Using the wrong one changes the meaning of the sentence.
Why is incidence common in research papers?
Researchers study patterns, frequencies, and rates. Since incidence refers to how often something occurs, it’s the correct term for statistical and scientific writing.
Why do news articles usually use incidents?
News reports describe specific events that happened, such as accidents, crimes, or emergencies. That’s why incidents is the appropriate choice.
Is incidence countable?
Usually, incidence is treated as an uncountable noun when referring to frequency or occurrence.
Example:
- The incidence of obesity has risen.
Which word is more common in everyday English?
Incidents is more common in everyday conversation because people usually talk about specific events. Incidence appears more often in formal, academic, medical, and statistical contexts.
Quick Summary
| Use Incidence When… | Use Incidents When… |
|---|---|
| Talking about frequency or rate | Talking about two or more events |
| Writing research papers | Writing news reports |
| Discussing disease statistics | Describing accidents or problems |
| Referring to measurable trends | Referring to actual occurrences |
| Using phrases like “incidence of” | Using phrases like “security incidents” |
Final Verdict: Incidence vs Incidents
The difference between incidence vs incidents is straightforward once you understand what each word represents.
- Use incidence when you’re referring to the rate, frequency, or occurrence of something. It’s the preferred choice in academic writing, medical research, statistics, public health, and other contexts where trends and measurements matter.
- Use incidents when you’re referring to two or more individual events. This is the correct word for workplace reports, police records, news articles, customer service logs, school reports, and everyday conversations.
Although the words share a similar spelling and origin, they are not interchangeable. Choosing the correct term makes your writing clearer, more accurate, and more professional.
Remember This Simple Rule
Incidence = How often something happens.
Incidents = What happened.
If you’re ever unsure, ask yourself one question:
- Am I talking about a frequency or rate? → Use incidence.
- Am I talking about actual events? → Use incidents.
Keeping this distinction in mind will help you avoid one of the most common vocabulary mistakes in English and ensure your writing is precise in academic, professional, and everyday contexts.
Lucy Young is an English grammar educator and content writer at GarmmarPro, passionate about creating clear, engaging lessons, practical examples, and learning resources that help students improve their English with confidence.
