A routine cold or flu often brings the usual set of problems, such as a cough, a sore throat, or a blocked nose. Yet an NHS doctor has urged people to pay close attention to one particular symptom, as it can sometimes point to a more serious illness. Speaking on BBC Morning Live, , Dr Aziza spoke with hosts Rav Wilding and Louise Minchin about a sign many people overlook, especially during winter virus season. Anyone at home who notices the same change has been advised to seek medical help promptly.This Common Cold Symptom Could Be CancerCold and flu infections frequently cause swollen glands, along with the typical symptoms of fever, congestion, and throat discomfort. This swelling is usually harmless and occurs when the body gears up to clear out germs. During the programme, Dr Aziza explained that when people refer to “swollen glands,” they are often talking about lymph nodes, which are small, bean-shaped filters that trap viruses and bacteria. These nodes sit in groups around the neck, under the arms, and in the groin.The doctor noted that swelling is a natural sign that the immune system is responding to a problem. It happens with common colds, flu, ear infections, and sore throats. Sometimes people may actually be feeling swollen salivary glands rather than lymph nodes, as these glands can become blocked as well.Other Conditions That May Trigger SwellingAlthough viral infections are the usual cause, swollen glands can also result from bacterial infections such as cellulitis, reactions to insect bites, changes in hormones, or occasionally after certain vaccinations. Most cases settle on their own within a week or two. Dr Aziza recommended rest, plenty of fluids, and standard pain relief to help ease discomfort. She advised against massaging the swollen areas because it can make the pain worse.When Swollen Glands Need Medical AttentionWhile swelling is typically short-lived, there are times when it should not be ignored. Dr Aziza urged viewers to book a GP appointment if the glands remain enlarged for more than two weeks, feel firm or fixed in place, or seem to be getting larger. Additional warning signs include constant night sweats, a continuing fever, difficulty swallowing or breathing, and swelling that appears above or below the collarbone. These features may point to more serious conditions such as lymphoma or other cancers.She explained that doctors may arrange blood tests, an ultrasound scan, or antibiotics if a bacterial infection is suspected. However, any breathing or swallowing problems require urgent medical assessment, and in some cases, A&E.Why Early Detection MattersDr Aziza highlighted that catching serious conditions early gives people a better chance of successful treatment and, in many cases, less invasive care. She encouraged everyone to become familiar with how their lymph nodes normally feel by carrying out simple monthly checks. This can be done by looking in the mirror and gently examining the neck, jawline, ears, armpits, and groin for changes in size, tenderness, or redness.Being aware of small differences can help people seek help sooner if something feels unusual. More detailed advice on swollen glands and when to see a doctor is available on the NHS website.