alarmed by + cause
Identifying the source of concern
By introduces the thing that caused alarm in passive structures.
The staff were alarmed by the warning message.
Alarm by, for, at, to, or about?
Alarm is usually followed by about or used in passive structures with by. Other combinations are limited or nonstandard.
Quick answer
Which prepositions are used with alarm?
Use alarmed by for the cause of fear or concern, and alarmed at or alarmed about for something worrying or surprising. Alarm to is not standard after this verb. Alarm for appears mainly in expressions of concern for someone's safety.
Residents were alarmed by the explosion.
She seemed alarmed at the sudden change.
Parents are alarmed about online safety.
She seemed alarmed at the sudden change.
Parents are alarmed about online safety.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
alarmed at + event
Reacting to something surprising
At is common with events, behaviour, or discoveries.
We were alarmed at the level of damage.
alarmed about + topic
Feeling worried about an issue
About introduces the topic causing concern.
Doctors are alarmed about the increase in cases.
alarm for + person
Expressing concern for someone
For appears mainly when speaking about fear for another person's safety or future.
She felt alarm for her children during the storm.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
alarm by
The community was alarmed by the rise in crime.
Standard in passive structures showing the cause.
alarm at
Investors were alarmed at the sudden losses.
Used for reactions to events or facts.
alarm about
Scientists are alarmed about climate change.
Used for ongoing concerns or topics.
alarm for
He felt alarm for his friend's safety.
Less common; expresses concern for someone.
alarm to
Nonstandard after alarm in modern English.
Use alarmed by, alarmed at, or alarmed about instead.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using alarm to after the verb
To is not a normal complement after alarm.
✕ She was alarmed to the news. ✓ She was alarmed by the news.Forgetting the passive structure
Alarmed by is more common than active alarm by.
✕ The news alarm by everyone. ✓ Everyone was alarmed by the news.Using for instead of about for topics
About is more natural for general issues.
✕ People are alarmed for pollution levels. ✓ People are alarmed about pollution levels.Quick practice
Choose the expression that matches the intended meaning.
1. Residents were alarmed ___ the loud explosion.
2. Many parents are alarmed ___ online scams.
3. We were alarmed ___ the condition of the bridge.
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Frequently asked questions
Is alarmed by more common than alarmed at?
Both are standard, but they emphasise slightly different meanings. By focuses on the cause, while at focuses on the reaction to something.
Can I say alarmed about something?
Yes. Alarmed about is natural for ongoing concerns or topics.
Is alarm to correct English?
Not as a normal verb-preposition combination after alarm.
Related preposition guides
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