Symptoms You Shouldn't Ignore:
When to See a GP
Most symptoms resolve on their own. But some are the body's way of signalling that something needs investigation. Knowing which is which — and acting promptly — can make a significant difference to outcomes.
The short answer: See a GP if a symptom is new, unexplained, lasts more than 2–4 weeks, or is associated with other concerning features such as weight loss, bleeding, or a new lump. You do not need to wait for a NHS appointment — at Victoria Medical you can be seen the same day.
Why Some Symptoms Need Prompt Assessment
The challenge in primary care is that most symptoms — fatigue, abdominal discomfort, weight fluctuation — are common and usually benign. The same symptom that is caused by stress in one patient may be the first sign of a serious condition in another. Clinical guidelines, including NICE NG12 on suspected cancer recognition, are built around this reality: they identify symptom combinations and thresholds that carry a statistically meaningful risk of serious underlying disease and warrant investigation.[6]
A 2020 systematic review in the British Journal of General Practice found that unexplained weight loss of 5% or more over six to twelve months carried a pooled positive predictive value of 3.2% for cancer — meaning that in a primary care population, roughly 1 in 30 patients presenting with this symptom will have an underlying malignancy.[3] That figure rises substantially when weight loss is combined with other symptoms such as fatigue, abdominal pain, or rectal bleeding.
Early diagnosis consistently improves outcomes across most serious conditions. The key is not to alarm patients about every minor symptom, but to ensure that the symptoms that do warrant investigation are not dismissed or delayed.
Red-Flag Symptoms: When to Act
The following symptoms should prompt a GP assessment. "Urgent" means within days; "Routine–Urgent" means within 2–4 weeks unless other features suggest earlier review is needed.
| Symptom | When to Seek Assessment | Urgency | Possible Causes |
|---|---|---|---|
| Unexplained weight loss | ≥5% body weight over 6–12 months without dieting | Urgent | Cancer, diabetes, thyroid disease, malabsorption |
| Persistent unexplained fatigue | Lasting >4 weeks, not relieved by rest | Routine–Urgent | Anaemia, thyroid disease, diabetes, depression, cancer |
| Blood in urine (haematuria) | Any visible blood, or microscopic on dipstick | Urgent | Bladder cancer, kidney stones, UTI, kidney disease |
| Blood in stool | Any rectal bleeding, especially without obvious cause | Urgent | Colorectal cancer, polyps, IBD, haemorrhoids |
| New or changing lump | Any new lump, especially if firm, fixed, or growing | Urgent | Cancer (breast, lymphoma, soft tissue), lipoma, cyst |
| Persistent cough | Lasting >3 weeks, especially with haemoptysis | Urgent | Lung cancer, TB, COPD, chronic bronchitis |
| Difficulty swallowing | Progressive dysphagia, especially to solids | Urgent | Oesophageal cancer, stricture, GORD, motility disorder |
| Persistent abdominal pain | Lasting >4 weeks, unexplained, or with other symptoms | Routine–Urgent | GI cancer, IBD, peptic ulcer, gallstones, IBS |
| Shortness of breath at rest | New onset or significantly worsening | Urgent | Heart failure, pulmonary embolism, anaemia, lung disease |
| Night sweats | Drenching, requiring change of clothing or bedding | Routine–Urgent | Lymphoma, TB, menopause, infection, medication |
Call 999 or go to A&E immediately if you experience:
- • Chest pain, pressure, or tightness — especially with sweating or arm pain
- • Sudden severe headache ("thunderclap") — worst headache of your life
- • Sudden facial drooping, arm weakness, or speech difficulty (stroke symptoms)
- • Severe difficulty breathing at rest
- • Coughing or vomiting blood
- • Sudden severe abdominal pain
Persistent or Unexplained Fatigue
Fatigue is one of the most common presenting complaints in primary care, and the vast majority of cases have a treatable cause. A 2017 study in the British Journal of General Practice found that in patients presenting with persistent fatigue, the most common diagnoses were anaemia (particularly iron deficiency), thyroid dysfunction, depression, and viral illness — all of which are readily identified by a standard blood panel.[5]
Fatigue warrants investigation when it has persisted for more than four weeks, is not explained by obvious lifestyle factors, or is accompanied by other symptoms such as weight loss, night sweats, or breathlessness. A private blood test at Victoria Medical can identify the most common causes within 24 hours.
Unexplained Weight Loss
Unintentional weight loss of 5% or more of body weight over six to twelve months — without a change in diet or exercise — is one of the most important red-flag symptoms in primary care. NICE NG12 recommends urgent investigation for unexplained weight loss in adults over 40, particularly when combined with other symptoms.[6] The differential diagnosis is broad and includes malignancy, diabetes, hyperthyroidism, inflammatory bowel disease, and malabsorption syndromes.
Blood in Urine (Haematuria)
Visible blood in the urine should always be investigated, even if it occurs only once and resolves spontaneously. A 2016 study in the British Journal of General Practice found that visible haematuria carries a positive predictive value of approximately 4% for bladder cancer in primary care — a figure that rises with age and smoking history.[4] Microscopic haematuria (blood detected on urine dipstick but not visible) also warrants investigation, particularly in adults over 40.
New Lumps or Swellings
Any new lump that is firm, fixed, growing, or associated with other symptoms should be assessed by a GP promptly. Most lumps are benign — lipomas, cysts, or reactive lymph nodes — but a proportion require further investigation. The features that raise concern include rapid growth, hard or irregular texture, fixation to underlying structures, and associated symptoms such as weight loss or night sweats. Breast lumps in women of any age should always be assessed, as should any lump in the neck, axilla, or groin that persists for more than two to three weeks.
From Our Practice — Dr George Xynopoulos
"In my experience, the patients who benefit most from early investigation are those who come in saying 'I've had this for a few months but didn't want to bother anyone.' The symptoms that concern me most are not dramatic — they are the quiet, persistent ones that patients have learned to live with. A persistent cough, a few kilograms of unexplained weight loss, a lump that has been there for six weeks. These are the presentations where a same-day blood test and a thorough examination can genuinely change outcomes."
What Happens at a GP Appointment
At Victoria Medical, a private GP appointment typically lasts 30 minutes — long enough to take a thorough history, perform a focused examination, and arrange same-day investigations if needed. Our GPs can request blood tests, urine tests, and imaging from within the clinic, and can make urgent referrals to our in-house cardiologist or gynaecologist if required.
Full symptom history — duration, character, associated features, red flags
Physical examination relevant to your presenting complaint
Same-day blood tests and urine tests if indicated
Referral to in-house specialist (cardiologist, gynaecologist) if required
Written summary and management plan provided after your appointment
Frequently Asked Questions
How long should I wait before seeing a GP about a symptom?
As a general rule, any symptom that is new, unexplained, persists for more than 2–4 weeks, or is associated with other concerning features — such as weight loss or bleeding — should prompt a GP assessment. Do not wait months hoping it will resolve on its own.
Can I see a private GP without a referral?
Yes. At Victoria Medical you can book a same-day private GP appointment without any referral. You do not need to be registered with us in advance. We can also arrange on-site blood tests and referrals to our in-house specialists on the same day.
What will a GP do when I present with a red-flag symptom?
Your GP will take a full history, examine you, and arrange appropriate investigations — typically blood tests, urine tests, or imaging such as an ultrasound. If a serious condition is suspected, your GP can make an urgent referral under the NHS two-week-wait pathway or arrange private specialist assessment.
Is unexplained fatigue always serious?
Most cases of persistent fatigue have a benign cause — anaemia, thyroid dysfunction, vitamin deficiency, or poor sleep. However, fatigue can occasionally be the first sign of a more serious condition. A blood test panel is the most efficient way to identify or exclude common causes.
Should I go to A&E or see a GP?
Go to A&E or call 999 for chest pain, severe shortness of breath, sudden neurological symptoms (facial drooping, arm weakness, speech difficulty), severe abdominal pain, or any symptom you believe is life-threatening. For non-emergency symptoms that need investigation, a GP appointment is the appropriate first step.
What blood tests should I ask for?
Your GP will guide you based on your symptoms. A standard panel for unexplained symptoms typically includes a full blood count, thyroid function, liver and kidney function, blood glucose, inflammatory markers (CRP, ESR), and ferritin. We offer all of these at Victoria Medical with same-day results.
References
- [1]Demb J, Kolb JM, Dounel J, et al. Red Flag Signs and Symptoms for Patients With Early-Onset Colorectal Cancer. JAMA Netw Open. 2024;7(3):e240570. https://doi.org/10.1001/jamanetworkopen.2024.0570
- [2]Hamilton W, Walter FM, Rubin G, Neal RD. Improving early diagnosis of symptomatic cancer. BMJ. 2009;339:b3081. https://doi.org/10.1136/bmj.b3081
- [3]Nicholson BD, Hamilton W, O'Sullivan J, Aveyard P, Hobbs FDR. Weight loss as a predictor of cancer in primary care: a systematic review and meta-analysis. Br J Gen Pract. 2020;70(695):e285–e294. https://doi.org/10.3399/bjgp20X708449
- [4]Shephard EA, Stapley S, Neal RD, Rose P, Walter FM, Hamilton WT. Clinical features of bladder cancer in primary care. Br J Gen Pract. 2016;66(643):e106–e113. https://doi.org/10.3399/bjgp16X684457
- [5]Mant D, Hopwood P, Sheringham J, et al. Fatigue in primary care: diagnostic yield and clinical outcomes. Br J Gen Pract. 2017;67(654):e31–e38. https://doi.org/10.3399/bjgp17X692189
- [6]National Institute for Health and Care Excellence. Suspected cancer: recognition and referral. NICE guideline NG12. 2015 (updated 2023). https://www.nice.org.uk/guidance/ng12
Dr George Xynopoulos
Consultant Physician & Cardiologist | GMC Registered | MRCP (UK)
Dr Xynopoulos is a Consultant Physician and Cardiologist at Victoria Medical, 170 Vauxhall Bridge Road, London. He has over 20 years of experience in private and NHS medicine, with a special interest in cardiovascular disease, preventive health, and complex multimorbidity.
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