So I've been feeling fever since yesterday night. And today, like, now

So I've been feeling fever since yesterday night. And today, like, now it is 100 degree Fahrenheit. And I am having very runny nose and sore throat as well. Also... I'm having a severe back pain. And you know my body is aching. So... What could it be? Well, then how do I go about it?

Your symptoms - fever (100°F), runny nose, sore throat, body aches, and back pain - point most likely to influenza (the flu) or another upper respiratory viral infection. The combination of systemic symptoms (body aches, back pain, fever) alongside nasal and throat symptoms is very characteristic of flu. A common cold is possible but usually causes milder systemic effects.

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fever runny nose sore throat body aches back pain diagnosis treatment 2025

Now let me search the medical library for detailed clinical guidance:

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I now have thorough information from authoritative medical sources. Here is a full, clear answer:

What's Likely Going On

Your symptom profile - fever (100°F/37.8°C), runny nose, sore throat, body aches, and back pain - fits influenza (the flu) very well. The key distinguishing feature of flu vs. a common cold is the systemic involvement: body aches, back pain, and fever hit hard and fast with flu, while a cold stays mostly nasal/throat with milder or no systemic symptoms.

Here's how the two compare (from Park's Textbook of Preventive and Social Medicine):

Feature	Influenza	Common Cold
Fever	Yes, typically 100-102°F+	Mild or absent
Body aches	Moderate to severe	Mild
Sore throat	Yes	Yes
Runny/stuffy nose	Yes	Yes (often more prominent)
Onset	Rapid (hours)	Gradual
Fatigue	Marked	Mild

Other possibilities to keep in mind:

COVID-19 - shares most of the same symptoms. Loss of smell/taste is more characteristic of COVID but not always present. A home antigen test can quickly rule this in or out.
Strep throat - causes fever and severe sore throat but usually WITHOUT runny nose; body aches are less prominent.
Common cold - possible but your degree of body aches and back pain leans more toward flu.

What You Should Do

Right now (home care):

Rest - Your body needs it. Stay home, don't push through.
Hydrate aggressively - Fever and sweating cause fluid loss. Water, oral rehydration drinks, warm broths, herbal teas. Aim for more than usual.
Fever and pain relief - Take paracetamol (acetaminophen) or ibuprofen for your fever, sore throat pain, and body aches. Follow label dosing. Do NOT take aspirin (risk of Reye's syndrome if viral illness).
Sore throat - Gargle with warm salt water. Throat lozenges also help.
Runny nose - Saline nasal drops can relieve congestion. OTC decongestants (pseudoephedrine, oxymetazoline nasal spray) can help but use sparingly.
Warm compress or heating pad for back/muscle pain gives good local relief.

Should you get an antiviral (Tamiflu/oseltamivir)?

According to Harrison's Principles of Internal Medicine (22nd Ed.) and Tintinalli's Emergency Medicine, antiviral drugs like oseltamivir (Tamiflu) are most effective when started within 48 hours of symptom onset - they shorten illness by about 1-2 days and reduce complication risk. Since your symptoms started last night, you are still within that 48-hour window - this is the time to act if you want antivirals.

Antivirals are strongly recommended if you fall into a high-risk group:

Age 65+
Pregnant
Asthma, COPD, diabetes, heart/kidney/liver disease
Immunocompromised
BMI ≥40

If you're a healthy adult with no risk factors, antivirals are optional (they reduce duration by ~1 day) but still worth considering since you're in the window.

To get antivirals, you'll need a prescription - call your doctor or visit an urgent care clinic today.

Warning Signs - Go to ER Immediately If:

These signs suggest serious progression and need urgent medical attention (per Park's Textbook and Rosen's Emergency Medicine):

Difficulty breathing or shortness of breath at rest
Chest pain
Confusion, altered mental status, hard to wake up
Lips or fingernails turning blue
Fever not going down despite paracetamol/ibuprofen or fever rising above 103°F (39.4°C)
No improvement after 72 hours or getting worse after initial improvement
Severe vomiting / not keeping fluids down
Decreased urination (sign of dehydration)

Quick Summary Plan

Step	Action
Today	Rest, fluids, paracetamol/ibuprofen for fever+pain
Today	Do a COVID home test if you have one
Today (urgent if in window)	Call doctor/urgent care about oseltamivir
Throat	Warm salt water gargle, lozenges
Back/body pain	Warm compress, ibuprofen
Monitor	Watch for the red-flag warning signs above

Most flu cases in otherwise healthy adults resolve in 5-7 days, though fatigue can linger 1-2 weeks. Feel better soon! If symptoms worsen or don't improve in 2-3 days, see a doctor in person.

Disclaimer: This is general health information and not a substitute for professional medical evaluation. Please consult a healthcare provider for diagnosis and treatment tailored to your specific situation.

I had taken Dolo 650. Uh, in the morning, like around at 10:30 AM, and right now it's around 3:30. Should I take another one because I'm already at 100 degree Fahrenheit?

Yes, you can take another Dolo 650 now. It has been 5 hours since your last dose (10:30 AM to 3:30 PM), and paracetamol (the active ingredient in Dolo 650) is safely dosed every 4 to 6 hours. You are well within the safe interval.

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Yes, go ahead and take another Dolo 650 now. Here's the clear breakdown:

Dolo 650 (Paracetamol/Acetaminophen 650 mg) - Dosing

	Details
Standard adult dose	325-1000 mg every 4-6 hours
Your last dose	10:30 AM
Time now	3:30 PM = 5 hours later
Safe to take?	✅ Yes - well past the 4-6 hour interval
Max dose per day	4 g (4000 mg) under doctor guidance; 3 g (3000 mg) for self-medication

(Source: Tintinalli's Emergency Medicine)

Your Running Dose Count (to stay safe today)

If you're tracking your doses today:

Dose 1: 10:30 AM - 650 mg
Dose 2: 3:30 PM - 650 mg ← take this now
Dose 3: Can take at ~8:30-9:30 PM if still needed
Dose 4: Can take before bed if needed

Total today so far = 1300 mg - well under the 3000 mg self-medication limit.

One thing to note about 100°F (37.8°C)

A temperature of 100°F is a low-grade fever. Paracetamol will bring it down, but don't be alarmed if it stays slightly elevated - that's your immune system working. Take the tablet now, drink a large glass of water with it, and rest.

If fever climbs above 103°F (39.4°C) or doesn't respond to Dolo at all, that's when you'd want to see a doctor.

Disclaimer: This is general health information, not a substitute for professional medical advice.

So I went to a doctor and the doctor gave me Calpol 650, Levocetirizine, Co-amoxiclav tablets, nose drops and some syrup. So is Calpol 650 as effective as Rolo 650?

Yes, Calpol 650 and Dolo 650 are exactly the same thing - both contain paracetamol 650 mg as the active ingredient. The only difference is the brand name. Calpol is made by GSK, Dolo is made by Micro Labs. Same drug, same dose, same effect.

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I have all the information needed. Here is a thorough breakdown of everything your doctor prescribed:

Calpol 650 vs. Dolo 650 - Are They the Same?

100% identical in effect. Both contain paracetamol 650 mg as the sole active ingredient. The only difference is the manufacturer:

Brand	Active Ingredient	Manufacturer
Dolo 650	Paracetamol 650 mg	Micro Labs
Calpol 650	Paracetamol 650 mg	GSK (GlaxoSmithKline)

Same drug, same dose, same mechanism, same effect. You can use Calpol exactly as you were using Dolo - every 4-6 hours as needed for fever and pain.

One important note: since you already took a Dolo 650 earlier today, that counts toward your daily total. Don't double-dose just because it's a different brand name.

Your Full Prescription - What Each Drug Does

1. Calpol 650 (Paracetamol)

For: Fever and body/throat pain
Reduces fever and relieves aches. Take every 4-6 hours as needed, max 3-4 tablets/day.

2. Levocetirizine (antihistamine)

For: Your runny nose and sore/scratchy throat
It is a second-generation H1 antihistamine - the active form of cetirizine (Zyrtec). It blocks histamine receptors, drying up the runny nose and reducing nasal inflammation. It has mast cell-stabilizing and anti-inflammatory properties on top of its antihistamine action, making it very effective for nasal symptoms.
It causes less sedation than older antihistamines but you may still feel slightly drowsy - avoid driving if so.
Typically taken once at night (standard dose: 5 mg). (Goodman & Gilman's Pharmacology)

3. Co-amoxiclav (Amoxicillin + Clavulanate)

For: Likely a bacterial co-infection your doctor suspects - possibly sinusitis, throat infection (pharyngitis/tonsillitis), or a secondary bacterial infection on top of your viral illness
This is a broad-spectrum antibiotic. Amoxicillin kills bacteria; clavulanate blocks the enzyme bacteria use to resist amoxicillin.
Per Harrison's Principles of Internal Medicine (22nd Ed.), amoxicillin/clavulanate is the antibiotic of choice for acute sinusitis and upper respiratory bacterial infections.
Very important: Complete the full course even if you feel better in 2-3 days. Stopping early causes antibiotic resistance and relapse.
Take it with food to reduce stomach upset.

4. Nose Drops

For: Nasal congestion/runny nose
Likely a decongestant (oxymetazoline/xylometazoline). Gives fast local relief.
Do not use for more than 5 days - longer use causes rebound congestion (your nose gets more blocked than before).

5. Syrup

Without knowing the exact name, it is most likely a cough/cold syrup (could contain dextromethorphan, guaifenesin, or chlorpheniramine). Follow the label dose - typically 5-10 mL every 6-8 hours.

Key Tips for Recovery

Take Co-amoxiclav with food - it can cause nausea on an empty stomach
Complete the full antibiotic course - do not stop early
Nose drops - max 5 days, use only when really blocked
Stay well hydrated - warm water, soups, broths
Rest as much as possible today and tomorrow
You should start feeling noticeably better within 48-72 hours on this regimen

Disclaimer: This is general health information. Your doctor has examined you and their instructions take precedence - follow the dose and timing they specified.

So basically, I don't know why the doctor gave antibiotics to me because my fever is like 100, 201 degree Fahrenheit. So it's a mild to moderate degree. 101, I said. And then, uh- Mm. ... how did he think that it is a bacterial fever and not a virus?

That's a really good and thoughtful question. The honest answer is: your doctor may not be 100% certain it's bacterial - and that's actually quite normal in clinical practice. Here's the full picture:

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This is excellent - the textbook gives a very direct and honest answer to your question. Here is the full picture:

Why Did the Doctor Give You Antibiotics?

The honest truth: it is often impossible to be certain at the bedside

According to Scott-Brown's Otorhinolaryngology (Head & Neck Surgery), one of the leading ENT reference textbooks:

"The clinical picture in an individual sore throat is of limited assistance in distinguishing between a bacterial and a viral aetiology. There is no evidence that bacterial sore throats are more severe than viral ones or that the duration of the illness is significantly different in the two types."

In other words - even doctors cannot reliably tell bacterial from viral just by looking at you. Your fever level of 101°F does NOT help decide either way.

What the Numbers Actually Say

Also from Scott-Brown's:

40-60% of pharyngitis/sore throat cases are caused by viruses
5-30% are caused by bacteria
In ~30% of cases, no pathogen is identified at all

So statistically, the majority of sore throats are viral, not bacterial. Yet antibiotics are very commonly prescribed - this is a well-known issue in medicine called antibiotic overprescription.

Why Doctors Prescribe Antibiotics Anyway - The Clinical Reasoning

Your doctor likely looked for certain clues during the examination that nudged them toward suspecting a bacterial component. These clues include:

What the Doctor May Have Seen	What It Suggests
Pus/white patches on tonsils (tonsillar exudate)	More likely bacterial (strep)
Swollen, tender lymph nodes in the neck	Bacterial infection sign
No cough	More suggestive of strep throat
Very red, inflamed throat	Could be either, but raises bacterial suspicion
High fever	Present in both, not conclusive

Bacterial tonsillitis with white exudate and red inflamed tissue

Tonsillitis - white purulent patches like this are a classic sign doctors look for to suspect bacterial infection. (Scott-Brown's Otorhinolaryngology)

The Other Reason: Preventing a Secondary Bacterial Infection

Even if your illness started as a viral infection (which it most likely did), viruses weaken your throat and nasal lining, making it easier for bacteria to pile on top - a so-called secondary bacterial infection. Co-amoxiclav covers this scenario too. Your doctor may have been treating preemptively to stop that from happening, especially since you have:

Sore throat
Runny nose (possible early sinusitis)
Body aches and fever persisting

Should You Be Worried About Taking Antibiotics Unnecessarily?

Not particularly worried, but it is worth knowing:

Co-amoxiclav is safe for a short course (usually 5-7 days)
The main downside of unnecessary antibiotics is gut disturbance (loose stools, stomach upset) - eat yogurt while taking it to protect your gut bacteria
Take probiotics or curd/yogurt daily alongside the course
Since the prescription has been given, complete the full course - do not stop midway even if you feel better, because stopping early is worse than completing it

Bottom Line

Your instinct is scientifically correct - a 101°F fever alone does not confirm bacterial infection. Your doctor made a clinical judgment call based on your overall examination, which is standard practice. It is not wrong - it is just how medicine works at the primary care level when lab tests aren't done. The good news is the medication won't harm you, and if there is a bacterial component, it will be dealt with.

Disclaimer: This is educational information. Your doctor has physically examined you and their clinical judgment takes precedence.

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