Saying “I am not feeling well” to your boss is something almost everyone has to do at some point. It is a simple sentence, but the way you say it can change how your manager reads the message. A clear, respectful sick-day message protects your professional image, while a vague or overly casual one can raise questions. That is why people search for other ways to say “I am not feeling well” to your boss: they want professional, formal, and email-ready alternatives that sound serious and considerate.
In this guide, you will find 28 alternatives grouped by tone and situation, from formal email phrases to friendly workplace messages. You will also find ready-to-copy email examples, common mistakes to avoid, and answers to the most searched questions about telling your boss you are sick. Whether you are writing your first sick-day email or you simply want a better way to phrase it, this list gives you the right words for every situation.
What Does “I Am Not Feeling Well” Mean?
The phrase “I am not feeling well” is a polite way of saying that your health is not normal. You may have a cold, the flu, a stomach bug, a headache, or simply feel too weak to work. It is intentionally general: it tells the other person that something is wrong with your health without forcing you to share details.
Literal Meaning
Literally, the phrase means your body or mind is not in its usual healthy state. It does not name a specific illness, which is why it works well in professional settings where medical details are private.
Tone
The tone is neutral and polite. It is neither dramatic nor casual, which makes it a safe default. However, it can sound a little flat or overused, especially if your boss hears it from team members every week. Choosing a fresher professional alternative can make your message feel more genuine.
Purpose
The purpose is practical: to inform your boss that you cannot work, or cannot work at full capacity, because of your health. It usually comes with a request, either for the day off, a lighter schedule, or permission to work from home.
Emotional Context
Saying you are unwell at work carries a small amount of stress for most people. You may worry about seeming unreliable. That is exactly why the wording matters: a professional phrase reassures your boss that you are taking the situation seriously and that you respect their time. A good sick-day message removes the awkwardness for both sides.
Examples of the basic phrase in use:
- “Hi Sarah, I am not feeling well today, so I will need to take the day off.”
- “Good morning, I am not feeling well enough to come in. I will keep you posted on tomorrow.”
- “I am not feeling well this afternoon, so I will log off early.”
Professional Usage: When to Use These Alternatives
You need a professional way to say you are unwell in more places than just a sick-day email. Here is where each context matters.
Emails
Email is the most common channel for sick-day messages. Use a formal or professional alternative, add a clear subject line, and keep the message short. Two or three sentences are enough. If you ever need to email your manager about schedule changes, the same calm, direct style works.
Workplace
In person or in a chat app like Slack or Teams, short workplace phrases such as “I need to call in sick today” are perfectly fine. The setting is less formal, so a friendly tone works, but stay brief and respectful.
Clients
With clients, lean formal. Phrases like “I am dealing with a health matter” protect your privacy and keep the focus on how the work will be handled, not on your symptoms. Always mention coverage or a new timeline.
Networking
If you need to cancel a networking meeting, a polite formal phrase plus a quick offer to reschedule keeps the relationship warm. Never cancel without proposing a new date.
Customer Service
Customer-facing teams need consistency. Use the same approved phrasing across the team, confirm coverage, and avoid dramatic language. Customers care about continuity, not your diagnosis.
28 Professional Alternatives to “I Am Not Feeling Well” to Your Boss
Below are 28 alternatives, each with its tone, the best situation for it, and a ready-to-use example sentence.
Professional Alternatives
1. I am feeling under the weather today.
Tone: Professional, mild.
Best use: General sick-day email or message when you are mildly ill.
Example: “Hi Mark, I am feeling under the weather today, so I will be taking a sick day.”
2. I am unwell and need to take the day off.
Tone: Professional, direct.
Best use: A straightforward sick-day email to your boss.
Example: “Good morning, I am unwell and need to take the day off. I will update you tomorrow.”
3. I am experiencing some health issues today.
Tone: Professional, discreet.
Best use: When you want privacy about the nature of your illness.
Example: “Hi Lisa, I am experiencing some health issues today and will be unavailable.”
4. I am not at my best health-wise today.
Tone: Professional, soft.
Best use: When you are unwell but may still answer urgent messages.
Example: “I am not at my best health-wise today, so I will work reduced hours and rest this afternoon.”
5. I have come down with something.
Tone: Professional, natural.
Best use: Casual-professional message for a sudden cold or flu.
Example: “I have come down with something overnight, so I will stay home today.”
6. I need to take a sick day today.
Tone: Professional, confident.
Best use: When your workplace culture supports direct sick-day requests.
Example: “I need to take a sick day today. I will reschedule my meetings for tomorrow.”
Formal Alternatives
7. I am indisposed today and will be unable to attend.
Tone: Formal, traditional.
Best use: Formal email to senior management or HR.
Example: “Dear Mr. Thompson, I am indisposed today and will be unable to attend the meeting.”
8. I am dealing with a health matter that requires rest.
Tone: Formal, private.
Best use: When the illness may last more than a day.
Example: “I am dealing with a health matter that requires rest, so I will be out for the next two days.”
9. Please consider me on sick leave today.
Tone: Formal, official.
Best use: Formal sick-leave requests, especially in companies with HR processes.
Example: “Please consider me on sick leave today. I have informed the team about my pending tasks.”
10. My doctor advised me to rest today.
Tone: Formal, credible.
Best use: When you want to add weight to your request.
Example: “My doctor advised me to rest today, so I will not be available until tomorrow.”
11. I regret to inform you that I am unwell.
Tone: Formal, courteous.
Best use: Very formal workplaces or written letters to management.
Example: “I regret to inform you that I am unwell and will be unable to report to work today.”
12. I am unable to come to work due to illness.
Tone: Formal, clear.
Best use: Official sick-day email with a no-nonsense tone.
Example: “I am unable to come to work due to illness. I will check email briefly this evening.”
Friendly Alternatives
13. I am feeling a bit off today.
Tone: Friendly, light.
Best use: Message to a boss you have a relaxed relationship with.
Example: “Hey, I am feeling a bit off today, so I will work from home and take it easy.”
14. I woke up feeling rough this morning.
Tone: Friendly, honest.
Best use: Early-morning sick-day text or chat message.
Example: “I woke up feeling rough this morning, so I am going to take the day to recover.”
15. I am not feeling like myself today.
Tone: Friendly, relatable.
Best use: When you feel unwell but cannot name a clear symptom.
Example: “I am not feeling like myself today, so I will log off early and rest.”
16. I am down with a bad cold.
Tone: Friendly, specific.
Best use: When naming the illness is fine and keeps things simple.
Example: “I am down with a bad cold, so I will stay home and avoid spreading it around the office.”
17. My body needs a rest day.
Tone: Friendly, casual.
Best use: Startups or relaxed teams with flexible sick-day norms.
Example: “My body needs a rest day, so I am taking today off and will be back tomorrow.”
18. I am battling a bug today.
Tone: Friendly, vivid.
Best use: Informal chat message to your manager.
Example: “I am battling a bug today, so I will keep my camera off and rest between tasks.”
Email Alternatives
19. I wanted to let you know that I am unwell.
Tone: Professional email style.
Best use: Opening line of a sick-day email.
Example: “Hi Daniel, I wanted to let you know that I am unwell, so I will be out today.”
20. I am writing to inform you that I need a sick day.
Tone: Formal email style.
Best use: Traditional workplaces that expect structured emails.
Example: “I am writing to inform you that I need a sick day. My current tasks are covered by Jane.”
21. I will be taking the day off to recover.
Tone: Professional email style.
Best use: Closing line of a sick-day email.
Example: “I have a fever, so I will be taking the day off to recover and will update you in the morning.”
22. I need to step away from work today for health reasons.
Tone: Professional, private.
Best use: Email when you prefer not to name the illness.
Example: “I need to step away from work today for health reasons. I will be back online tomorrow.”
23. Please note that I will be unavailable today due to illness.
Tone: Formal email style.
Best use: Email to your boss with a CC to the team.
Example: “Please note that I will be unavailable today due to illness. Tom will cover my client calls.”
Workplace Alternatives
24. I need to call in sick today.
Tone: Direct, workplace standard.
Best use: Phone call or quick message to your manager.
Example: “Hi, I need to call in sick today. I will send a proper email in a few minutes.”
25. I am taking a personal health day.
Tone: Professional, modern.
Best use: Companies that treat sick days and wellness days the same.
Example: “I am taking a personal health day today and will catch up on messages tomorrow.”
26. I am out sick today.
Tone: Brief, workplace standard.
Best use: Slack or Teams status message.
Example: “I am out sick today. For anything urgent, please contact Priya.”
27. I am working from home with limited availability due to illness.
Tone: Professional, remote-work style.
Best use: Remote teams where partial availability is normal.
Example: “I am working from home with limited availability due to illness, so I will reply to urgent items only.”
28. I may need to leave early today due to feeling unwell.
Tone: Professional, cautious.
Best use: When symptoms start during the workday.
Example: “I may need to leave early today due to feeling unwell. I will finish the report before I go.”
Quick Comparison Table
| Alternative | Tone | Best Use |
|---|---|---|
| Under the weather | Professional | General sick-day email |
| I am unwell | Professional | Direct sick-day message |
| Indisposed | Formal | Senior management or HR |
| On sick leave | Formal | Official leave request |
| Feeling a bit off | Friendly | Relaxed boss relationship |
| Down with a bad cold | Friendly | Naming a mild illness |
| I wanted to let you know I am unwell | Sick-day email opening | |
| Unavailable today due to illness | Email to boss and team | |
| Call in sick | Workplace | Phone or quick chat message |
| Out sick today | Workplace | Slack or Teams status |
Email Examples for Telling Your Boss You Are Unwell
Here are copy-ready examples for the most common situations. Keep them short: greeting, one clear sentence about your health, coverage or next update, sign-off.
To Your Manager
Subject: Sick leave today
“Hi Rachel, I am feeling under the weather today, so I will be taking a sick day. My report is saved in the shared folder, and I will update you tomorrow morning. Thanks, Alex.”
To a Colleague
“Hi Sam, I am unwell today and taking the day off. Could you cover the 2 PM standup for me? I will catch up on notes tomorrow.”
To a Client
Subject: Rescheduling today’s call
“Dear Ms. Carter, I am dealing with a health matter today, so I need to reschedule our call. My colleague James will join in my place, or we can move it to Thursday. My apologies for the change.”
Team Message
“Team, I am out sick today. For anything urgent, please reach out to Daniel. I will be back online tomorrow.”
Meeting Follow-Up
“Hi everyone, I was unable to join today’s meeting due to illness. Could someone share the notes? I will follow up on my action items tomorrow.”
Tip: if your absence comes at the last minute, it also helps to apologize for the short notice in the same email. A short, sincere apology keeps the message professional instead of abrupt.
Common Mistakes to Avoid
Overexplaining Your Symptoms
Your boss does not need a list of symptoms. One clear sentence about being unwell is enough. Long medical details can sound unprofessional and make both sides uncomfortable.
Using the Wrong Tone
“I feel like death lol” is too casual for most bosses, while “I regret to inform you of my indisposition” may sound stiff in a relaxed startup. Match the tone to your workplace culture.
Being Too Vague
“I can’t come in today” with no reason can worry a manager or look careless. Always name the reason briefly: illness, health, or feeling unwell.
Forgetting Coverage
The biggest email etiquette mistake is ending your message without saying who covers your work. Even one line (“Tom will handle my calls”) changes how your message is received.
Apologizing Too Much
One short apology is fine, but repeating “sorry” five times sounds insecure. You are using earned sick leave, not asking for a favor.
15 Related Phrases for Calling in Sick
- Under the weather: Feeling mildly ill. “I am a bit under the weather today.”
- Call in sick: To phone your workplace to report illness. “I had to call in sick this morning.”
- Take a sick day: To use a day off for illness. “I am taking a sick day to recover.”
- Battle a bug: To fight off an illness. “He is battling a stomach bug.”
- Take a personal day: A day off for personal reasons, including health. “I am taking a personal day tomorrow.”
- Nurse a cold: To rest and recover from a cold. “I am home nursing a cold.”
- Be on the mend: To be recovering. “Thanks, I am finally on the mend.”
- Feel queasy: To feel sick in the stomach. “I feel too queasy to travel today.”
- Catch a bug: To get an infection. “I caught a bug on the flight.”
- Bedridden: Too ill to get out of bed. “She was bedridden for two days.”
- Medical leave: Official time off for health reasons. “He is on medical leave this month.”
- Rest up: To get plenty of rest to recover. “I will rest up and be back Monday.”
“I Am Not Feeling Well” vs. Alternatives: Phrase Comparison
The original phrase is safe and universally understood, but it is also plain and easy to ignore in a busy inbox. Professional alternatives like “under the weather” or “I am unwell” carry the same meaning with a more polished sound. Formal options such as “indisposed” or “on sick leave” fit official emails and HR records, while friendly ones like “feeling a bit off” suit relaxed teams.
For email, the best choices are structured phrases: “I wanted to let you know that I am unwell” or “Please note that I will be unavailable today due to illness.” These read as complete, considerate messages rather than fragments. For quick workplace chats, “I am out sick today” or “I need to call in sick” are the standard picks. The right choice always depends on three things: your audience, the channel, and your company culture. When in doubt, go one step more formal than your instinct: it is always safer with a boss.
Cultural Usage
US English
In the US, “I am not feeling well,” “I am sick,” and “I am taking a sick day” are all standard. American workplaces value directness, so short messages with clear coverage plans work best. “Under the weather” is widely understood and sounds professional without being stiff.
UK English
In the UK, “I am unwell,” “I am off sick,” and “I am indisposed” are common. British workplace emails tend to be slightly more formal, and “I am afraid I am unwell” is a classic polite opener.
Corporate Communication
Large companies often have formal sick-leave policies. Use official language like “sick leave” or “medical leave,” follow the reporting chain, and copy HR when required. Keep records of your messages.
Customer Service
Customer service roles need fast coverage. Tell your supervisor early, name your replacement, and use the team’s standard phrasing so customers never notice a gap.
Networking
When canceling on a professional contact, pair a polite health phrase with a new meeting proposal. “I am unwell today, could we move our coffee to next Tuesday?” keeps the door open.
FAQs: Telling Your Boss You Are Not Feeling Well
1. What is the most professional way to tell your boss you are sick?
“I am unwell and need to take the day off” is the most professional all-purpose choice. For email, open with “I wanted to let you know that I am unwell” and add who is covering your tasks.
2. Should I say “I am not feeling well” or “I am sick”?
Both work, but “I am not feeling well” is softer and more polite, while “I am sick” is more direct. For a boss, the softer phrase usually reads better, especially in writing.
3. Is “under the weather” professional enough for an email to your boss?
Yes. “Under the weather” is a well-established professional idiom in both US and UK workplaces. It sounds natural without being casual.
4. Do I need to give my boss details about my illness?
No. A general statement like “I am experiencing some health issues” is enough. You are not required to share medical details, and most managers prefer not to hear them.
5. Can I text my boss that I am not feeling well?
It depends on your workplace norms. If your team uses texting or chat apps for quick updates, a short message is fine, but follow up with an email when your company expects one.
6. What should I write in the subject line of a sick-day email?
Keep it clear: “Sick leave today,” “Out sick today,” or “Unable to work today due to illness.” Your boss should understand the message before opening it.
7. How early should I inform my boss that I am unwell?
As early as possible, ideally before your shift starts or within the first hour of the workday. Early notice gives your boss time to arrange coverage.
8. Is it okay to say “I am taking a sick day” to my boss?
Yes, in most modern workplaces this is perfectly professional. It is direct and confident. In very formal companies, “Please consider me on sick leave today” may fit better.
9. What is a formal alternative to “I am not feeling well”?
“I am indisposed today” and “I am dealing with a health matter that requires rest” are strong formal alternatives. “I regret to inform you that I am unwell” also works for very formal settings.
10. Should I apologize when telling my boss I am sick?
A brief apology is polite, especially for last-minute notice, but do not overdo it. One “sorry for the short notice” is enough; you are using sick leave you are entitled to.
Final Summary
Choosing the right words to tell your boss you are unwell is a small skill with a big payoff. For everyday professional use, “I am under the weather” and “I am unwell and need to take the day off” are your safest picks. In formal settings, reach for “indisposed” or “on sick leave.” With a relaxed manager, friendly options like “feeling a bit off” keep things human. For email, structured openers such as “I wanted to let you know that I am unwell” always land well. Whatever phrase you choose, send it early, name your coverage, and keep it brief. If you want to check the exact dictionary sense of the word, see the Cambridge Dictionary definition of unwell. And remember, when a teammate shares their own sick-day news, a little kindness goes a long way: learning professional ways to say I am sorry to hear that helps you respond with genuine empathy at work.
