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

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, especially during the flu season. While it’s often due to mild causes, it can occasionally signal something more serious.

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.  
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 serious condition.  
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. Serious 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. Some of the red flag signs and symptoms are listed below.  

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 seek medical help in Australia  

• If your fever is 38°C or higher and doesn’t improve with rest/fluids  
• If you have a stiff neck, rash, confusion, or sensitivity to light (it's possible it may be meningitis, and you need to be assessed by a doctor urgently)  
• If the headache is sudden, severe, or unlike anything you’ve had before  
• If you’re pregnant, elderly, or have a chronic illness  
• If symptoms last longer than 2–3 days without improvement  

Online medical support in Australia  

Telehealth platforms like Hola Health connect you with Aussie GPs online. They can assess your symptoms, provide medical certificates, and arrange tests or referrals if needed—without you leaving home. 

How Hola Health Can Support You

If you're experiencing a fever and headache without other apparent symptoms, it can feel unsettling to gauge whether it's something mild or potentially severe. Hola Health provides a convenient way to receive medical guidance quickly and without leaving home. Through 24/7 telehealth consultations, you can talk with a real registered doctor (in as little as 15 minutes) who will ask about your symptoms, medical history, and risk factors to help rule out serious causes. If needed, the physician can provide an online prescription, issue a medical certificate, or refer you for further tests—all of which can be delivered digitally. By using Hola Health, you gain fast access to professional oversight when you're not sure whether what you're feeling is "just a bug" or something to watch more closely, giving you peace of mind and direction in your next steps.

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.  

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 a being assessed in a telehealth consult by a registered Australian doctor.  

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 doctor's visit.  

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. If you suspect a sinus infection, a doctor can confirm the diagnosis and prescribe appropriate treatment.  

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.