It is worth mentioning that

You usually place this at the very beginning of a sentence. It acts as a bridge between two ideas. For example, you might be discussing a new software update. You describe the features. Then you add, It is worth mentioning that the update requires 10GB of space. It’s like a verbal post-it note. You can also use it in the middle of a paragraph to pivot. It prevents your writing from feeling like a random list of facts. It tells the reader, "Pay attention, this part matters for the bigger picture." Just don't use it for every single sentence, or you'll sound like a broken record.

This is a high-level phrase. You will see it most often in C1 or C2 level academic writing. It is the king of the 'Formal' world. Think of university essays, business reports, and legal documents. It is also very common in professional emails. However, it’s not just for old books. You’ll hear it in high-quality video essays on YouTube. Tech reviewers use it to point out a specific spec. In a casual WhatsApp chat with friends? It might sound a bit too stiff. If you tell your friend, "It is worth mentioning that I am hungry," they might think you've swallowed a dictionary. Use it when you want to sound smart, organized, and professional.

Look at a LinkedIn post about industry trends. The author will often use this to highlight a statistic. Check out a Netflix documentary script. The narrator uses it to introduce a surprising historical fact. Even on Twitter (or X), people use it in long threads to add context. "The new iPhone looks great. It is worth mentioning that the battery life hasn't actually changed." It’s perfect for 'Review' culture. Whether you are reviewing a movie on Letterboxd or a product on Amazon, it helps you sound like an expert. It’s the difference between "The food was cold" and "It is worth mentioning that the food arrived an hour late, which likely caused the temperature issue."

Use it when a detail is relevant but not the primary focus. It’s great for 'pro/con' lists. It’s perfect for job interviews when you want to add a skill that wasn't on your resume. Use it in emails to your boss to show you are being thorough. It’s very useful when you want to be polite about a negative point. Instead of saying "This plan is bad," you say, "It is worth mentioning that this plan exceeds our budget." It softens the blow. It makes you sound like a diplomat. Use it whenever you want to add 'fine print' to a conversation. It's also great for academic presentations when you're moving between slides.

Avoid this phrase in a heated argument with your partner. "It is worth mentioning that you forgot to do the dishes" will likely make things worse. It’s too cold for emotional moments. Don't use it for trivial things either. "It is worth mentioning that I like cheese" is just weird. Also, stay away from it in very casual texting. If you’re using emojis and slang, this phrase will look like a guy in a tuxedo at a pool party. It doesn't fit the 'vibe.' Finally, don't use it if the information is actually the main point. If the house is on fire, don't say "It is worth mentioning that there are flames in the kitchen." Just scream "FIRE!"

One big mistake is mixing up the grammar. Many people try to use the 'to' infinitive.

Another error is forgetting the that.

Sometimes people over-complicate it.

Don't add the extra it in the middle! It’s also common to see people use it for things that are NOT worth mentioning. If the fact is obvious, the phrase loses its power. Don't be the person who says, "It is worth mentioning that the sun rises in the east." We know, Dave. We know.

If you want to mix things up, you have options. It should be noted that is a very close cousin. It’s even a bit more formal. It is also important to note that is another great choice. For something slightly more modern, you could say, A key point to consider is.... If you are in a meeting and want to be a bit quicker, try Notably, .... In British English, you might hear It’s worth noting. In American business settings, people sometimes say For the record, ... though that carries a slightly different 'legal' feel. If you're writing a blog post and want to be more 'lifestyle' friendly, try One thing to keep in mind is.... Variety is the spice of life, even in formal writing!

Is this phrase too formal for an email to a colleague? Not if the email is about a project or a serious task. It’s better than being too casual! Can I use it in a speech? Yes, it’s a great 'signpost' to help the audience follow your logic. Why is it mentioning and not mention? Because worth is followed by the -ing form (gerund) in English. It’s just one of those fun grammar rules we love to hate! Does it mean the same thing as 'By the way'? Sort of, but 'By the way' is casual and 'It is worth mentioning that' is professional. Think of 'By the way' as a t-shirt and this phrase as a blazer.