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Punctuation before "However"
What punctuation should I use before "however"?
Writers often ask whether they should use a period (full stop), a semicolon, or a comma before a word like "however."Use a period (full stop) or a semicolon before "however" when it joins two sentences. Do not use a comma. Using a comma before "however" (or any other conjunctive adverb) is a common writing mistake called a run-on sentence.
- I asked Tom. However, I'm not convinced he knows.
- I asked Tom; however, I'm not convinced he knows.
- I asked Tom, however, I'm not convinced he knows.

More about the Punctuation before "However"
The word "however" is often used as a bridge between two sentences. For example:- I love seafood. However, I can't eat shellfish.
Use a Comma after "However"
When "however" is used as a transitional phrase, there is always a comma after it but never before.- I missed the early plane, however, I still made the meeting.
More Examples with Periods and Semicolons
Remember that a transitional phrase will usually start a new sentence, but if you would like a smoother transition than that afforded by a period, you can use a semicolon.Here are some examples (transitional phrases shaded):
- I missed the early plane. However, I still made the meeting.
- I missed the early plane; however, I still made the meeting.
- Everyone knows he is guilty. However, it will never be proved.
- Everyone knows he is guilty; however, it will never be proved.
- Sarah's guest was turned away by the doorman. As a result, she left before the presentations.
- Sarah's guest was turned away by the doorman; as a result, she left before the presentations.
- Business is booming. For example, Siemens has made 10 orders since 4 o'clock yesterday.
- Business is booming; for example, Siemens has made 10 orders since 4 o'clock yesterday.
- The paper is stuck in the lift. Consequently, we cannot finish the printing.
- The paper is stuck in the lift; consequently, we cannot finish the printing.
Not a Comma!
Remember that you cannot use a comma before "however" or any other transitional phrase. For example:- She does not loathe chess, on the contrary, she quite likes it.
- My security guards are not trained in fire-fighting, therefore, we called the fire service.
- It is extremely foggy, nevertheless, the game will be played.
Start a New Sentence Nine Times out of Ten
Generally speaking, a period is by far the better option. Terms like "however" and "as a result" work better with a more abrupt start. Read more about using semicolons.The Main Culprit is "However"
The run-on error is most commonly seen with the word "however."- I am leaving now, however, I will be back on Wednesday to collect my wages.
Be Careful with "So"
When "so" means "therefore," it is a transitional phrase and should be followed by a comma not preceded by one. Like all transitional phrases, it should be preceded with a period or a semicolon. For example:- We are not in a position to fund the changes. So, the current system will remain until at least April when it will be reviewed again.
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