Fever and headache, no other symptoms – What could it mean? 

This blog is for educational purposes only and does not replace professional medical advice or diagnosis. If you have health concerns, consult an AHPRA-registered telehealth doctor or request a medical certificate online if clinically appropriate. Please note: Hola Health does not currently offer Mental Health Care Plans.

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Overview

If you're suffering from a fever and headache without any other symptoms, it can be confusing and sometimes concerning. In Australia, fevers are one of the most common reasons people see a GP or medical practitioner, especially during flu season. While it’s often due to mild causes, it can occasionally signal something more serious.

A telehealth consultation can be a convenient way to discuss your symptoms with a doctor from home when an online consultation is clinically appropriate. However, telehealth medical practitioners cannot perform physical neurological examinations, such as checking for neck stiffness or reflexes.

If you have a severe headache with a stiff neck or confusion, call 000. This content is for general informational purposes only and does not constitute medical advice, diagnosis, or treatment. We recommend sharing your consultation summaries with your regular doctor or medical practitioner.

Understanding the symptoms

• Fever – This is your body’s natural response to fight against infections or inflammation.  
• Headache – This is a common symptom that can be triggered by fever, dehydration, or an underlying condition. 

Causes of fever + headache (without other symptoms)  

1. Viral infections - Sometimes the flu or other viruses start with just fever and headache before other symptoms appear. In Australia, these are very common during winter months, and indeed, in mild cases, other symptoms may not even show up later.  Worsening viral symptoms during the night can be particularly distressing, so speaking with an after-hours doctor or medical practitioner ensures you have professional support available the moment your condition changes."
2. Mild bacterial infections - Localised bacterial infections (such as urinary tract infections or sinus infections) can cause fever and headache without showing any strong early signs. However, they may develop other symptoms later such as stinging when passing urine, or stuffiness and pain in the sinuses.  
3. Dehydration or heat-related illness - In hot Aussie summers, dehydration and heat exhaustion can trigger both fever and a headache. This often happens if you’ve been outdoors or not drinking enough fluids. Severe exposure to heat can lead to heat-stroke which is a health concern.  
4. Medication or vaccine side effects - Some medicines and vaccines can cause short-term fever and headache. This is usually mild and settles within 1–2 days and can be managed with simple pain relief.  
5. Helath conditions (less common) - Meningitis or other serious infections can begin with fever and headache alone. These need urgent medical review, especially if symptoms worsen quickly. Fever and headache combined with a stiff neck or sensitivity to light can indicate Meningitis. 

  Call 000 or go to the Emergency Department immediately if you have:

• Severe neck stiffness (cannot touch chin to chest).
• A rash that doesn't fade when pressed.
• Confusion or extreme drowsiness.
• Severe sensitivity to light (photophobia).
• Seizure or fainting.

 

Other symptoms to watch for 

Even though your main complaints are fever and headache, keep an eye out for any additional symptoms that might pop up. These could provide valuable clues to the underlying cause. For example, a runny nose or cough might point to a viral infection, while a stiff neck could be a red flag for meningitis.  

Home remedies & self-care  

1. Rest – This helps your body fight infection and recover faster.  
2. Stay hydrated – Drinking enough water and electrolytes prevents dehydration and eases headaches.  
3. Cool compress – Applying a cool cloth on your forehead may help to reduce fever and soothe your pain.  
4. Over-the-counter relief – Certain medications can lower fever and also ease headaches.  

When to see a doctor

• If fever is 38°C or higher and doesn’t improve with rest/fluids.
• If symptoms last longer than 2–3 days.
• If you have recently traveled overseas (to rule out tropical diseases).

 

Can a telehealth doctor help with fever and headache?

If you have a fever and headache without other obvious symptoms, speaking with a doctor can help you understand your symptoms and whether further assessment may be needed. A telehealth doctor can discuss your symptoms, medical history and other relevant factors through an online consultation when your condition is suitable for telehealth.

During a telehealth consultation, the doctor may ask when your symptoms started, how severe your fever and headache are, whether you have developed any other symptoms and what medications you are taking. If an in-person examination or further testing is needed, the doctor can advise you on the appropriate next step.

If you're eligible for the service, you can book a telehealth appointment through Hola Health and speak with an AHPRA-registered practitioner.

How Hola Health may be able to help

Hola Health is an Australian telehealth platform that connects you with registered doctors and nurse practitioners — from the comfort of your home, at a time that suits you. Depending on your situation, a Hola Health clinician may be able to help with:

• 24/7 General medical advice via telehealth doctor consult — talk through symptoms or health concerns with a registered doctor or medical practitioner
• Sick certificate online  — for work or personal leave, when clinically appropriate
• Referrals to specialists - or in-person services when needed
• Instant script (if clinically appropriate) — at a clinician's discretion and where clinically suitable
• Pathology or imaging requests — when assessed as appropriate by your treating clinician

Hola Health clinicians are AHPRA-registered Doctors and medical practitioners in Australia. They will always recommend an in-person consultation, specialist referral, or emergency care if that is in your best interest. Note: Telehealth is not suitable for all conditions. Hola Health does not replace your regular GP, specialist, or emergency services. If you are unsure whether telehealth is right for your situation, we recommend speaking with your usual healthcare provider. In emergencies, call 000.

FAQs  

Can fever and headache without cough be flu?  

Yes, flu can start with just fever and headache before other symptoms appear. Cough often develops later so sometimes it can be hard to distinguish in the early stages.  

Is fever and headache a sign of meningitis? 

 It can be, especially if paired with a stiff neck, rash, or confusion. You should seek urgent medical help if you notice these red flags.  

How long should I wait before seeing a doctor for fever + headache?  

If your symptoms don’t improve in 2–3 days, or if they worsen suddenly, you should see a GP or medical practitioner.  

Can dehydration cause fever and headache? 

 Yes, especially in hot weather. Lack of fluids can raise your temperature and trigger headaches.  

Can I get a medical certificate online for fever and headache in Australia?  

Yes, services like Hola Health offer online medical certificates if approved after being assessed in a telehealth consultation by a registered doctor in Australia.

What infections in Australia cause fever and headache without other symptoms?  

Early viral illnesses, mild bacterial infections, and mosquito-borne diseases (like Ross River virus) can present this way. You should always monitor your symptoms closely.  

Can a fever and headache be a sign of stress? 

Yes, stress can trigger a physiological response that includes both fever and headache. If you suspect stress is the culprit, try relaxation techniques, exercise, or other stress-management strategies. However, if the symptoms persist, it's wise to rule out other causes with a visit to a doctor or medical practitioner.

How can I tell if my headache and fever are due to a sinus infection? 

Sinus infections often cause pain or pressure in the face, especially around the forehead, cheeks, and eyes. You might also experience nasal congestion, a runny nose, and a reduced sense of smell. A doctor or medical practitioner can typically diagnose a sinus infection based on your history and symptoms during a telehealth consultation, without needing physical invasive tests. 

Which fever comes with a headache? 

Many types of fevers can be accompanied by headaches. This includes fevers caused by viral infections, bacterial infections, sinus infections, heat exhaustion, and inflammatory conditions. The headache can be due to the fever itself or the underlying cause.  

Is it normal to have a headache and fever after being in the sun? 

Yes, it can be. Spending too much time in the sun without adequate hydration can lead to heat exhaustion, which can cause both headache and fever. It's important to rest in a cool place, drink fluids, and seek medical attention if symptoms worsen. 

Stats

• 38°C or higher is generally considered a fever in adults. Fever is usually part of the body's immune response to an infection. 

• Headache can occur with fever, including with common viral infections such as flu and COVID-19. 

• Having no cough, sore throat or other obvious symptoms does not rule out an infection. Fever can also occur with urinary, gastrointestinal and other bacterial or viral infections. 

• Most headaches are not serious, but a headache accompanied by fever can sometimes indicate a more serious infection, including meningitis. 

• Fever with headache plus neck stiffness, confusion, vomiting, seizures or changes in vision requires urgent medical attention. 

• Dehydration can also contribute to headache, particularly when you have a fever and aren't drinking enough fluids.