Many English learners feel confused when they see incidence and incidents because the two words look almost the same.
At first glance, it is easy to think they are different forms of the same word. However, they have different meanings and are used in different situations.
This confusion often happens because both words come from the same root and are related to events in some way. But incidence talks about how often something happens, while incidents refers to actual events or situations that happen.
Knowing this small but important difference can make your English sound much more natural.
You may hear these words in school, newspapers, hospitals, workplaces, business reports, and daily conversations.
If you use the wrong one, your sentence may sound strange or even change its meaning. That is why learning when to use each word is important.
The good news is that the difference is not difficult once you understand the basic idea. Simple grammar rules, clear examples, and real-life situations can help you remember which word fits each sentence.
By the end of this guide, you will know what incidence means, what incidents means, how they differ, when to use each one, and how to avoid common mistakes.
You will also learn easy memory tips that make choosing the correct word much easier in everyday English.
What Does “Incidence” Mean?
Incidence is a singular noun. It means the rate, frequency, or number of times something happens during a certain period or within a particular group of people.
Instead of talking about one event, incidence focuses on how common or how rare something is. It is often used in reports, research studies, medicine, science, education, business, and statistics.
Simple Definition
Incidence = the frequency or rate at which something happens.
Think of it this way:
- Incidence measures how often something happens.
- It does not describe the event itself.
- It describes the occurrence rate.
When to Use “Incidence”
Use incidence when you talk about:
- The rate of diseases
- The frequency of accidents
- Crime rates
- Research findings
- Scientific studies
- Business reports
- Statistical information
These situations usually involve numbers, percentages, or comparisons.
Grammar Rule
Incidence is usually an uncountable noun when referring to a rate or frequency.
Common sentence patterns include:
- incidence of + noun
- high incidence of…
- low incidence of…
- increasing incidence of…
- decreasing incidence of…
Examples of “Incidence”
- The incidence of flu rises during winter.
- Doctors studied the incidence of heart disease in older adults.
- The town has a low incidence of crime.
- Researchers measured the incidence of diabetes over ten years.
- The school reported a high incidence of bullying last year.
- There has been a decrease in the incidence of traffic accidents.
- Scientists compared the incidence of allergies in different countries.
- The government wants to reduce the incidence of workplace injuries.
Why Is “Incidence” Common in Medical English?
If you read health articles or medical reports, you will often see the word incidence.
For example:
- incidence of cancer
- incidence of malaria
- incidence of asthma
- incidence of infection
Doctors use this word because they want to know how many new cases appear during a certain time.
Example:
The incidence of dengue fever increased after the rainy season.
Here, the sentence does not mean one case happened. It means the number of new cases became higher.
“Incidence” in Business and Education
The word is not limited to healthcare.
Businesses may say:
- the incidence of employee absenteeism
- the incidence of customer complaints
- the incidence of product defects
Schools may discuss:
- the incidence of cheating
- the incidence of bullying
- the incidence of school violence
Again, the focus is on how often these problems happen, not on individual events.
Common Learner Confusion
Many learners think incidence means an incident.
That is incorrect.
Look at these sentences:
❌ The police investigated the incidence.
✅ The police investigated the incident.
Why?
Because the police investigate an event, not a rate.
Now compare:
✅ Researchers studied the incidence of theft.
This means they studied how often theft happened, not one specific theft.
Another example:
❌ The fire incidence damaged the building.
✅ The fire incident damaged the building.
Here, we are talking about one event, so incident is correct.
Words Often Used with “Incidence”
You will often see these collocations:
- high incidence
- low incidence
- increasing incidence
- decreasing incidence
- incidence rate
- incidence of disease
- incidence of crime
- incidence of poverty
- incidence of accidents
- annual incidence
Learning these common word pairs will help your English sound more natural.
What Does “Incidents” Mean?
Incidents is the plural form of incident.
An incident is an event, situation, or occurrence, especially one that is unusual, unexpected, important, or sometimes unpleasant.
So:
- incident = one event
- incidents = two or more events
Unlike incidence, this word talks about actual things that happened, not how often they happened.
Simple Definition
Incidents = events or situations that happened.
They may be:
- accidents
- fights
- arguments
- crimes
- emergencies
- misunderstandings
- security problems
- unusual situations
When to Use “Incidents”
Use incidents when talking about:
- several accidents
- multiple fights
- different crimes
- workplace problems
- school events
- security issues
- police reports
- unusual happenings
Grammar Rule
Incidents is a countable plural noun.
It can be used with numbers and quantity words.
Examples:
- two incidents
- several incidents
- many incidents
- a few incidents
- three separate incidents
- multiple incidents
Examples of “Incidents”
- The police investigated several incidents during the weekend.
- Two security incidents were reported yesterday.
- The teacher discussed the classroom incidents with the students.
- There have been many traffic incidents this month.
- Airport staff handled several unexpected incidents calmly.
- The company reviewed all safety incidents from last year.
- Firefighters responded to three separate incidents overnight.
- News reporters covered several violent incidents in the city.
“Incidents” in Everyday English
This word is common in daily conversation.
For example:
“My son had two small incidents at school today.”
This could mean:
- he fell down
- he argued with a classmate
- he broke something
The speaker is talking about events, not statistics.
Another example:
“There were several incidents during the football match.”
This means several things happened, such as:
- fans argued
- players fought
- someone entered the field
Again, these are actual events.
“Incidents” in News Reports
Journalists often use incidents because they report events.
For example:
- Several incidents were reported after the storm.
- Police responded to multiple incidents overnight.
- Security incidents increased during the festival.
- Emergency teams handled all incidents quickly.
Notice that these sentences describe things that happened, not the frequency of those events.
Common Learner Confusion
Many students mistakenly write:
❌ There were three incidences yesterday.
Although incidences exists as a plural form in some specialized contexts, it is rarely used in everyday English and usually refers to different types or instances of rates, not events.
If you mean three events, the correct sentence is:
✅ There were three incidents yesterday.
Another common mistake:
❌ The hospital recorded many incidents of cancer.
This sounds incorrect because cancer is measured by its frequency, not by individual events.
The correct sentence is:
✅ The hospital recorded a high incidence of cancer.
Common Words Used with “Incidents”
These collocations are very common:
- traffic incidents
- safety incidents
- security incidents
- criminal incidents
- violent incidents
- workplace incidents
- serious incidents
- minor incidents
- unexpected incidents
- reported incidents
Learning these natural combinations will help you speak and write English more confidently.
Difference Between Incidence and Incidents (Detailed)
At first, incidence and incidents look very similar. They even come from the same Latin root. However, they are not interchangeable. One talks about how often something happens, while the other talks about the events themselves.
A simple way to remember the difference is this:
- Incidence = a rate or frequency
- Incidents = actual events or situations
Once you understand this idea, choosing the correct word becomes much easier.
Comparison Table
| Feature | Incidence | Incidents |
|---|---|---|
| Part of speech | Singular noun | Plural noun |
| Meaning | The rate or frequency of something happening | Two or more events or situations |
| Countable? | Usually uncountable | Countable |
| Focus | How often something happens | What actually happened |
| Common fields | Medicine, science, research, statistics | News, police reports, schools, workplaces, daily conversations |
| Common pattern | incidence of + noun | several incidents, many incidents |
| Example | The incidence of flu is rising. | Several incidents were reported today. |
Meaning Difference
The biggest difference is the focus of each word.
Incidence measures how common something is.
Example:
The incidence of road accidents has fallen.
This sentence talks about the number or rate of accidents, not one specific accident.
Incidents, on the other hand, refers to actual events.
Example:
Three road incidents happened yesterday.
Now we are talking about three separate events.
Grammar Logic
Think about what you want to describe before choosing the word.
Ask yourself:
Am I talking about the frequency of something?
If the answer is yes, use incidence.
Example:
- The incidence of obesity has increased.
Here, the speaker is discussing how common obesity has become.
Now ask:
Am I talking about one or more events?
If the answer is yes, use incident or incidents.
Example:
- Police investigated several incidents near the shopping mall.
Here, police investigated actual events.
Sentence Structure Difference
These sentence patterns can help you remember the correct usage.
Structure with “Incidence”
Incidence + of + noun
Examples:
- incidence of cancer
- incidence of crime
- incidence of poverty
- incidence of flooding
- incidence of illness
Example sentences:
- The incidence of asthma is higher in cities.
- Researchers examined the incidence of depression.
- The incidence of workplace injuries has dropped.
Notice that incidence is almost always followed by of.
Structure with “Incidents”
Number/quantity + incidents
Examples:
- three incidents
- several incidents
- many incidents
- two serious incidents
Example sentences:
- Three incidents happened during the meeting.
- Several incidents were reported this week.
- The company reviewed all safety incidents.
Unlike incidence, incidents does not need of after it.
Meaning Comparison Through Examples
Look at these pairs carefully.
Example 1
✅ The incidence of diabetes is increasing.
Meaning:
Doctors are talking about the growing number of new cases.
✅ Several diabetes-related incidents were reported.
Meaning:
This refers to specific events, such as emergencies involving diabetes.
Example 2
✅ The incidence of crime has fallen.
Meaning:
Crime has become less common.
✅ Police investigated five criminal incidents.
Meaning:
Police investigated five separate crimes or events.
Example 3
✅ The incidence of bullying worries teachers.
Meaning:
Bullying happens too often.
✅ Teachers discussed several bullying incidents.
Meaning:
They talked about specific bullying cases.
Example 4
✅ Scientists studied the incidence of allergies.
Meaning:
They measured how common allergies are.
✅ Nurses dealt with several allergy-related incidents.
Meaning:
They handled specific medical situations.
When Both Words Can Appear Together
Sometimes both words appear in the same paragraph because they describe different things.
Example:
The hospital noticed a higher incidence of infections this year. Several serious incidents involving infected patients were also reported.
The first sentence talks about the overall rate.
The second sentence talks about specific events.
This is a good example of why the two words should never be confused.
Which Word Is More Common?
It depends on the situation.
You will often see incidence in:
- medical reports
- scientific research
- academic writing
- government statistics
- public health studies
You will often see incidents in:
- newspapers
- television news
- police reports
- schools
- offices
- daily conversations
Understanding the context makes choosing the right word much easier.
Grammar Rules You Must Remember
These four grammar rules will help you use these words correctly every time.
Rule #1: Use “Incidence” for Rates or Frequency
Whenever you talk about how common something is, use incidence.
Correct:
- The incidence of flu increases during winter.
- The incidence of theft has decreased.
- Researchers measured the incidence of cancer.
Incorrect:
- The incidents of flu increased.
Why?
Because flu is measured by its rate, not by individual events.
Rule #2: Use “Incidents” for Actual Events
If you mean real events or situations, use incidents.
Correct:
- Several incidents happened after the storm.
- Two traffic incidents delayed commuters.
- Police investigated multiple incidents.
Incorrect:
- Several incidence happened yesterday.
Remember:
Events = incidents.
Rule #3: “Incidence” Is Usually Followed by “Of”
Most of the time, incidence appears in the pattern:
incidence of + noun
Examples:
- incidence of disease
- incidence of accidents
- incidence of poverty
- incidence of crime
- incidence of obesity
Example sentences:
- The incidence of malaria is falling.
- Doctors studied the incidence of heart disease.
This is the most natural and common structure.
Rule #4: “Incidents” Can Be Counted
Since incidents is a plural countable noun, it works with numbers and quantity words.
Examples:
- one incident
- two incidents
- several incidents
- many incidents
- a few incidents
Example sentences:
- Four incidents occurred during the holiday.
- Several safety incidents were reported.
- The manager investigated two incidents.
You cannot count incidence in this way when referring to frequency.
Common Mistakes Students Make
Learning similar-looking words can be difficult. Here are some common mistakes and simple ways to avoid them.
Mistake #1: Using “Incidence” Instead of “Incident”
❌ The police investigated the incidence.
✅ The police investigated the incident.
Why?
Police investigate events, not rates.
Tip: If you can point to something that happened, use incident or incidents.
Mistake #2: Using “Incidents” Instead of “Incidence”
❌ The incidents of heart disease are increasing.
✅ The incidence of heart disease is increasing.
Why?
Heart disease is measured by its frequency, not by individual events.
Tip: If your sentence talks about statistics, use incidence.
Mistake #3: Forgetting “Of”
Many learners write:
❌ The incidence crime is high.
Correct:
✅ The incidence of crime is high.
The word of is an important part of this common expression.
Mistake #4: Treating “Incidence” Like a Countable Noun
Incorrect:
❌ We studied five incidences of crime.
This sounds unnatural in ordinary English.
Correct:
✅ We studied the incidence of crime.
or
✅ We studied five crime incidents.
The first sentence discusses the rate of crime.
The second discusses five separate events.
Mistake #5: Thinking Similar Spelling Means Similar Meaning
Many English words look alike but have different meanings.
For example:
- advice vs advise
- affect vs effect
- incidence vs incidents
Do not choose a word only because it looks familiar. Always ask what your sentence is really describing.
Easy Correction Tips
Whenever you are unsure, ask yourself these questions:
- Am I talking about how often something happens?
- Or am I talking about something that happened?
If the answer is how often, choose incidence.
If the answer is an event, choose incident or incidents.
This simple habit will prevent most mistakes.
Easy Trick to Remember the Difference
A good memory trick can help you remember these words for years.
Trick 1: Think About Statistics
The word incidence is often used with numbers, percentages, graphs, and research.
Imagine a doctor looking at a chart.
The doctor says:
“The incidence of flu has increased.”
The doctor is studying statistics, not individual patients.
So remember:
Incidence = statistics = frequency.
Trick 2: Think About News Headlines
Now imagine watching the evening news.
The reporter says:
“Several incidents were reported downtown today.”
The reporter is talking about actual events.
So remember:
Incidents = events = things that happened.
Trick 3: Ask One Easy Question
Before choosing the word, ask yourself:
“Am I talking about a number or an event?”
- Number, rate, frequency → Incidence
- Event, accident, situation → Incident/Incidents
This one question can help you make the correct choice almost every time.
Daily Life Examples
Learning grammar becomes much easier when you see words used in everyday situations. The following examples show how incidence and incidents appear in natural English. Read each sentence carefully and notice why one word is correct while the other is not.
- The incidence of seasonal flu usually increases during the winter months.
- Here, we are talking about how common the flu is.
- The police responded to three traffic incidents before noon.
- This sentence refers to three separate events.
- The school is trying to reduce the incidence of bullying among students.
- The focus is on the overall rate of bullying.
- Several minor incidents happened during yesterday’s football match, but no one was seriously hurt.
- These are actual events that occurred during the game.
- Doctors are studying the incidence of allergies in young children.
- Researchers are measuring how often allergies occur.
- Our office reported two safety incidents last month.
- The sentence talks about two specific workplace events.
- The city has worked hard to lower the incidence of road accidents.
- This means the city wants to reduce the frequency of accidents.
- Security guards handled several incidents at the shopping mall.
- These were real situations that required attention.
- Scientists noticed a higher incidence of asthma in areas with heavy air pollution.
- The sentence discusses the rate of asthma cases.
- After the concert, police investigated a few incidents near the stadium.
- Here, incidents means specific events that happened after the concert.
A Short Conversation
Ali: Why are doctors worried this year?
Sara: Because the incidence of dengue fever has increased.
Ali: Oh, I understand. They’re talking about the number of new cases.
Sara: Exactly. Yesterday, there were also two hospital incidents, but those were separate events.
This short conversation shows how both words can appear together while keeping their different meanings.
Practice Section
Choose the correct word: incidence or incidents.
1. The hospital reported a higher ________ of pneumonia this winter.
A. incidence
B. incidents
2. Police investigated three security ________ during the night.
A. incidence
B. incidents
3. Researchers studied the ________ of childhood obesity.
A. incidence
B. incidents
4. Several unexpected ________ delayed the train service.
A. incidence
B. incidents
5. The government wants to reduce the ________ of workplace accidents.
A. incidence
B. incidents
Answers
- A. incidence
- B. incidents
- A. incidence
- B. incidents
- A. incidence
Bonus Practice
Fill in the blanks with the correct word.
- The __________ of flu is lower this year.
- Two unusual __________ happened at the airport.
- Doctors measured the __________ of diabetes.
- Firefighters responded to several __________ overnight.
- The city has reduced the __________ of crime.
Answers
- incidence
- incidents
- incidence
- incidents
- incidence
If you answered all five correctly, you have a strong understanding of the difference between these two words.
Frequently Asked Questions (FAQs)
What is the difference between incidence and incidents?
Incidence refers to the rate or frequency of something happening, especially in statistics, medicine, or research. Incidents is the plural form of incident and refers to two or more actual events or situations. One measures frequency, while the other describes events.
Can we use incidence in everyday conversations?
Yes, but it is more common in formal discussions, health topics, scientific studies, news reports, and statistics. In casual conversations, people usually use incident or incidents unless they are talking about rates or trends.
Is incidents singular or plural?
Incidents is the plural form of incident. If you are talking about one event, use incident. If you are talking about two or more events, use incidents.
Examples:
- One incident occurred yesterday.
- Several incidents occurred yesterday.
Can incidence be used with “of”?
Yes. In fact, incidence is most commonly used in the pattern incidence of + noun.
Examples:
- incidence of cancer
- incidence of crime
- incidence of disease
- incidence of poverty
Using of after incidence makes your English sound natural and grammatically correct.
Why do students confuse incidence and incidents?
Students often confuse these words because they look and sound similar. However, their meanings are different. Incidence talks about how often something happens, while incidents refers to the events themselves. Remembering this simple difference helps avoid most mistakes.
Is incidence formal or informal?
Incidence is generally considered a formal word. It is common in academic writing, medical reports, scientific research, government publications, and business documents. Incident and incidents are used in both formal and everyday English.
Final Conclusion
Although incidence and incidents look almost identical, they serve different purposes in English. Incidence refers to the rate or frequency of something happening, while incidents refers to actual events or situations.
Understanding this difference will help you write and speak more accurately, especially in school, at work, or when reading news articles and reports.
A simple way to remember them is to think about the main idea behind each word. If you are discussing statistics, percentages, or how common something is, choose incidence.
If you are talking about events that actually happened, use incident or incidents.
The more examples you read and the more sentences you practice, the more natural these words will become.
Try using them in your own writing and conversations whenever possible. Over time, choosing the correct word will become a habit, and your English will sound clearer, more confident, and more professional.
With regular practice, confusing incidence and incidents will soon be a thing of the past.
I am Benjamin Clark, an English language writer passionate about simplifying grammar, vocabulary, and word meanings. I create clear, accurate, and practical content to help learners improve their English skills with confidence every day.
