Australians have a well-earned reputation for toughing things out. We push through. We tell ourselves it’s probably nothing. We book a GP appointment in our head — and then don’t quite get around to making it.
Sometimes that instinct serves us. Most headaches are just headaches. Most stomach aches pass by morning.
But some symptoms are your body’s way of sending a serious message — and the difference between acting on them early or leaving them too long can be the difference between a simple treatment and a much harder one.
Many serious health conditions begin with subtle changes. What may seem manageable today can progress quickly without assessment. A GP is trained to identify risk early, investigate causes, and guide timely treatment. Early GP intervention often reduces the need for hospitalisation and supports better long-term outcomes.
This guide covers the warning signs that should always prompt a GP visit — and the ones that mean you need to head straight to emergency.
First: Know the Difference Between GP and Emergency
Before diving into specific symptoms, it helps to know where to go when something doesn’t feel right.
Call 000 or go to your nearest emergency department immediately for:
- Chest pain or pressure, especially with sweating, nausea, or pain spreading to the arm or jaw
- Sudden severe headache — the worst headache of your life
- Difficulty breathing that comes on suddenly
- Sudden weakness, numbness, slurred speech, or facial drooping (signs of stroke)
- Loss of consciousness or seizure
- Severe allergic reaction
- Uncontrolled bleeding
Book a GP appointment urgently (same day or next day) for:
- Any of the persistent symptoms listed in this guide
- New symptoms you can’t explain
- Symptoms that are worsening over days or weeks
- Anything that feels genuinely wrong, even if you can’t quite name why
If a symptom is sudden, severe, persistent or simply worrying, it’s best to seek medical advice. Trust your instincts — concern is a valid reason to see a doctor.
Between visits: Australia’s healthdirect service (1800 022 222) is a free 24/7 nurse-on-call line. If you’re unsure whether a symptom needs emergency care, calling healthdirect is a sensible first step.
The Warning Signs You Should Never Ignore
1. Unexplained Weight Loss
Losing weight without changing your diet or exercise habits is never something to celebrate without understanding why. Unexplained weight loss is often the first notable sign of cancer — usually of the oesophagus, lung, pancreas, or stomach. Ovarian cancer is more likely to cause weight loss when a tumour presses against the stomach, making you feel full faster.
Beyond cancer, unexplained weight loss can also indicate an overactive thyroid, type 1 diabetes, inflammatory bowel disease, severe depression, or chronic infection.
The threshold that should prompt a GP visit: losing more than 5% of your body weight — roughly 3–4 kg for most adults — over 6 to 12 months without a clear reason. Don’t wait for it to keep happening. Book in.
2. Persistent Fatigue That Doesn’t Improve With Rest
Feeling tired after a big week is expected. But fatigue that is crushing, persistent, and doesn’t improve with proper sleep and rest — for weeks on end — is a clinical symptom that deserves investigation.
Persistent fatigue is associated with a wide range of conditions: iron deficiency anaemia, hypothyroidism, type 2 diabetes, heart disease, sleep apnoea, depression, and certain cancers including lymphoma and leukaemia. A heart that is not pumping well forces the body’s systems to work harder to compensate, leaving you experiencing diffuse weakness and exhaustion.
Fatigue is also one of the most commonly dismissed symptoms — particularly in women, who are more likely to have it attributed to stress or overwork without further investigation. If your fatigue is affecting your daily functioning and has lasted more than two to three weeks, it warrants blood tests and a proper assessment.
3. Any Unexplained Bleeding
Bleeding that is unexplained or occurs outside of normal patterns — including rectal bleeding, blood in vomit or urine, or postmenopausal vaginal bleeding — should never be ignored.
Here is a breakdown by type:
Blood in your stool: Bright red blood on the toilet paper or in the bowl most commonly comes from haemorrhoids — but it can also indicate bowel polyps or bowel cancer. Bowel cancer is the second most common cancer in Australia, with around 14,000 new cases diagnosed each year. If detected early, the chance of successful treatment and long-term survival improves significantly. Never assume rectal bleeding is just haemorrhoids without having it checked first.
Blood in urine: Even a small amount, even just once, should be investigated. Causes range from urinary tract infections and kidney stones to bladder or kidney cancer.
Coughing up blood: Haemoptysis — coughing up blood — is alarming and should never be ignored. It can range from blood-streaked sputum to coughing up larger amounts, and can indicate infections like tuberculosis or pneumonia, severe bronchitis, or lung cancer.
Postmenopausal vaginal bleeding: Any vaginal bleeding that occurs after menopause has fully established — defined as 12 consecutive months without a period — should be assessed by a GP promptly. It can signal uterine cancer, cervical cancer, or other gynaecological conditions that are highly treatable when caught early.
4. A New or Changing Lump
Any new or persistent lump or swelling in any part of your body should be taken seriously. A new lump is one of the most common signs of breast cancer. Lumps can vary in characteristics — they may be painful or painless. This applies everywhere — breast, neck, armpit, groin, abdomen, or testicles. Most lumps are benign, but only a GP assessment can confirm that.
Key features that make a lump more urgent:
- It has appeared recently and is growing
- It is hard or firm rather than soft and movable
- It doesn’t move freely under the skin
- It is accompanied by skin changes or unexplained weight loss
- You feel generally unwell alongside it
The chance of a woman developing breast cancer up to age 85 is one in seven. Approximately 17,000 women are diagnosed with breast cancer every year in Australia. When breast cancer is detected early, women have a much greater chance of being treated successfully. Don’t wait to see if it goes away. Book a GP appointment within a week of noticing a new lump.
5. A Cough Lasting More Than 3 Weeks
A cough from a cold is completely normal. A cough that lingers for three weeks or more — particularly one that is changing in character, producing blood, or accompanied by breathlessness or chest pain — is not.
A persistent cough in a current or former smoker deserves particularly prompt attention. Lung cancer often presents with a persistent cough, and Australia now has a free National Lung Cancer Screening Program designed to detect lung cancer early, before symptoms appear, in individuals at the highest risk. Ask your GP whether you might be eligible.
Other causes of a persistent cough — postnasal drip, acid reflux, asthma, or medication side effects — are all worth identifying and treating. A cough that has lasted more than three weeks always has a reason. Find out what it is.
6. Changes in Bowel or Bladder Habits
It is important to get to know your body and what is normal for you, including your bowel habits. Persistent changes in bowel habits — including diarrhoea or constipation, more frequent bowel movements, or stools that are narrower than usual — can be caused by several conditions, including bowel cancer.
See your GP if you notice:
- A change in your usual bowel pattern that has persisted for more than 4 weeks
- A feeling that your bowel hasn’t fully emptied after going to the toilet
- Frequent or urgent urination, difficulty urinating, or blood in urine
Bowel changes are one of the symptoms Australians are most likely to dismiss out of embarrassment or the assumption that they’re caused by diet. Bowel cancer is one of the most common cancers in Victoria, however over 90% of cases can be successfully treated when detected early. The free National Bowel Cancer Screening Program test kit — available to all Australians aged 45–74 — is one of the simplest things you can do for your health.
7. Chest Pain or Pressure — Even Mild
A crushing, squeezing, or tight sensation in the chest — particularly radiating to the arm or jaw and accompanied by shortness of breath, sweating, or nausea — may indicate a heart attack or another serious cardiac event.
Chest pain doesn’t always announce itself dramatically. Some heart attacks present as a dull ache, persistent pressure, or a feeling of heaviness that comes and goes. Women in particular more often experience atypical heart attack symptoms — fatigue, nausea, jaw or back pain, and shortness of breath — without the classic crushing chest pain.
If you have chest pain that is severe, sudden, or accompanied by other symptoms — call 000 immediately. Do not drive yourself to hospital.
If you have chest pain that is milder, comes and goes, or you’re uncertain about — book a GP appointment the same day. Chest pain, shortness of breath, or irregular heartbeat are warning signs that should be assessed promptly. With early detection of cardiovascular disease in primary care, patients reduce the risk of long-term heart failure.
8. Shortness of Breath on Exertion
Being puffed after intense exercise is normal. Being noticeably breathless walking up a flight of stairs, carrying groceries, or doing tasks that never used to wind you — is not.
Shortness of breath that comes on gradually is particularly dangerous because people adapt to it without realising they’ve changed. If you’ve quietly accepted that you get more breathless than you used to, that is the sign to get checked.
Shortness of breath on exertion can indicate heart disease, anaemia, a clot in the lungs (pulmonary embolism), lung disease, or asthma. Shortness of breath by itself is a symptom that should be addressed — you don’t need another symptom alongside it to justify a GP visit.
9. A Skin Spot or Mole That Has Changed
Australia has one of the highest rates of skin cancer in the world. While most moles are harmless, the appearance of any new spots or changes in colour, thickness, or shape over a period of weeks to months can be a sign of skin cancer. Become familiar with your own skin so you can pick up changes early.
The ABCDEs of melanoma:
- A — Asymmetry: One half doesn’t match the other
- B — Border: Edges are irregular, ragged, or blurred
- C — Colour: Multiple shades in the one spot (brown, black, red, white, or blue)
- D — Diameter: Larger than 6mm
- E — Evolving: Any change in size, shape, colour, or a new symptom like bleeding or itching
At Central Health Clinic in Sunshine, our GPs perform skin cancer checks and can assess any spot that concerns you. If you haven’t had a skin check recently — particularly if you’ve had significant lifetime sun exposure — book one.
10. A Severe or “Thunderclap” Headache
Most headaches have benign causes — tension, dehydration, or migraine. But one type of headache is a medical emergency: the sudden, severe headache that hits like a thunderbolt and rapidly reaches maximum intensity. This thunderclap headache can signal a subarachnoid haemorrhage — bleeding in the brain — which is life-threatening.
If you have the worst headache of your life — particularly if it came on suddenly — call 000.
Recurring or progressively worsening headaches — even without the thunderclap quality — also warrant a GP assessment, especially if they come with neurological symptoms like numbness, visual disturbance, or weakness. If you are accustomed to not having headaches, and start having them regularly, that is a sign something may be wrong.
11. Persistent Fever Without an Obvious Cause
A short fever with a cold or flu is the immune system doing exactly what it should. A fever that doesn’t come with a clear infection — or one that persists for more than a week without improving — is a different matter.
Conditions associated with persistent unexplained fever include urinary tract infections (which can cause low-grade fever without classic symptoms in older adults), tuberculosis, hidden abscesses, autoimmune conditions, and — less commonly — lymphoma and other blood cancers.
A fever over 39.4°C, or any fever that persists beyond 3–5 days without improvement, should be assessed by a GP promptly.
12. Difficulty Swallowing That Persists
Occasional difficulty swallowing after eating too fast is not concerning. But persistent dysphagia — difficulty getting food or liquid down, a sensation of food sticking in the throat or chest, or pain when swallowing — always warrants investigation.
Causes range from acid reflux and inflammation to narrowing of the oesophagus or oesophageal cancer. When difficulty swallowing comes alongside unexplained weight loss, it makes prompt assessment even more important.
13. Persistent Heartburn or Indigestion
You may experience some discomfort after eating a large, spicy, or fatty meal — but if you have heartburn or indigestion frequently, or if it is very painful, see your GP.
Heartburn that occurs most days, doesn’t respond to standard antacids, disturbs your sleep, or is accompanied by difficulty swallowing or weight loss is not ordinary reflux and needs proper assessment. Long-standing acid reflux can cause Barrett’s oesophagus — where the lining of the oesophagus changes — which increases the risk of oesophageal cancer. Catching this early through endoscopy allows for monitoring and intervention before cancer develops.
14. Sudden Changes to Vision
Sudden changes to your sight — a curtain falling across your visual field, sudden blurring in one eye, or the appearance of new floaters and flashing lights — can indicate a retinal detachment or other emergency that requires same-day assessment.
Gradual changes in vision — especially in people with diabetes or high blood pressure — should not be left unmanaged either. Diabetic retinopathy and hypertensive retinopathy develop silently and can cause permanent vision loss if not detected and treated early. Regular eye checks and GP monitoring significantly reduce this risk.
15. Changes in Mood, Memory, or Behaviour
Mental health is just as important as physical health. Sudden or ongoing changes in mood or behaviour should never be ignored. GPs play a vital role in mental health care, offering support, referrals, and treatment plans.
This includes:
- Depression or anxiety that has persisted for more than two weeks and is affecting daily functioning
- Sudden personality changes in an older person — which can signal a urinary tract infection, medication interaction, or early dementia
- Memory lapses that are new, frequent, or worsening — particularly if others have noticed
- Confusion, disorientation, or difficulty finding words that wasn’t present before
Many people delay seeking help for mental health changes far longer than they would for a physical symptom. Mental health conditions respond to treatment — and the earlier you see your GP, the more options are available to you.
The Australian Screening Programs Every Adult Should Know About
Beyond responding to symptoms, Australia offers several free, population-based screening programs that detect serious conditions before symptoms appear:
Bowel cancer screening — the National Bowel Cancer Screening Program is free for Australians aged 45–74. People aged 50–74 are sent a free home test kit every two years. People aged 45–49 can request a free screening kit by mail.
Breast cancer screening — 1 in 7 Australian women will develop breast cancer in their lifetime. Free mammograms through BreastScreen Australia are recommended every two years for women aged 50–74, with women aged 40–49 also eligible.
Cervical cancer screening — the cervical screening test is recommended every 5 years for women aged 25–74, and can be done by your GP.
Lung cancer screening — Australia’s National Lung Cancer Screening Program offers free CT lung scans every two years for high-risk current or former smokers aged 50–70. Ask your GP if you might qualify.
If you’ve been sent a bowel screening kit and haven’t done it, or if you’re overdue for a mammogram or cervical screen — book in with your GP today. These programs save lives specifically because they catch things before symptoms develop.
The “Rule of Three Weeks”
A useful rule of thumb: if a symptom has lasted three weeks or more and you can’t clearly explain it, get it checked.
This applies to a cough, persistent fatigue, a bowel change, a skin change, or a mouth ulcer that hasn’t healed. Serious illness does not go away by itself, and with a lot of medical issues, the earlier you get treatment, the better your chances are for a positive outcome.
Three weeks is not a rigid rule — some symptoms need immediate attention regardless. But as a general threshold for persistent, non-emergency symptoms, it’s a practical guide worth remembering.
Frequently Asked Questions
What symptoms should I never ignore? The symptoms most warranting urgent GP assessment are: unexplained weight loss, persistent fatigue, any unexplained bleeding (blood in stool, urine, or coughed up), a new or changing lump, a cough lasting more than 3 weeks, persistent changes in bowel or bladder habits, chest pain or pressure, shortness of breath on exertion, skin changes or evolving moles, difficulty swallowing, persistent fever without a clear cause, and changes in mood, memory, or behaviour.
When should I go to emergency vs. see my GP? Go to emergency (or call 000) for sudden, severe, or life-threatening symptoms: severe chest pain, the worst headache of your life, sudden weakness or slurred speech, difficulty breathing, uncontrolled bleeding, or loss of consciousness. See your GP urgently for persistent or unexplained symptoms that are concerning but not immediately life-threatening.
How do I know if a skin spot is skin cancer? Use the ABCDE guide: Asymmetry, irregular Border, multiple Colours, Diameter over 6mm, and Evolving. Any spot that is new, changing, bleeding, or itching should be assessed by a GP. Australia has one of the highest rates of skin cancer in the world — annual skin checks are strongly recommended.
What is the rule of three weeks for GP visits? Any symptom that has lasted three weeks or more without a clear explanation should prompt a GP visit. This includes a cough, fatigue, bowel changes, skin changes, and mouth ulcers. It’s a practical general threshold for persistent, non-emergency symptoms.
What free cancer screening is available to Australians? Australia offers free bowel cancer screening (ages 45–74), breast cancer mammograms (ages 40–74), cervical screening every 5 years (ages 25–74), and lung cancer CT screening for high-risk smokers aged 50–70. All can be discussed with or arranged through your GP.
What if my GP says it’s nothing but I still feel something is wrong? Trust your instincts. If a symptom persists, worsens, or is accompanied by new symptoms, go back and report the change. It is entirely appropriate to ask for further tests or a second opinion. Sometimes conditions take time to show up on initial tests, or different tests are needed.
The Bottom Line
Your body is remarkably good at communicating. The signals it sends aren’t always dramatic — sometimes they’re subtle, easy to dismiss, and convenient to ignore. But persistent, unexplained changes in how you feel or function are worth taking seriously.
Timely GP care provides clarity, reassurance, and a clear plan when symptoms are uncertain, helping patients avoid unnecessary stress or delayed diagnosis. Most GP visits for worrying symptoms end in reassurance. Some end in a diagnosis that changes the course of what happens next — and in those cases, the appointment that felt unnecessary might turn out to be the most important one you ever made.
At Central Health Clinic in Sunshine, our GPs are experienced in assessing a wide range of symptoms and conditions — including skin cancer checks, chronic disease management, women’s health, and mental health care. If something doesn’t feel right, don’t wait. Book an appointment today.
Useful Australian Resources:
- healthdirect (24/7 nurse advice line): 1800 022 222 | healthdirect.gov.au
- Cancer Council Australia helpline: 13 11 20 | cancer.org.au
- National Bowel Cancer Screening Program: bowelcanceraustralia.org
- BreastScreen Victoria: breastscreen.org.au
- Beyond Blue: 1300 22 4636 | beyondblue.org.au
