For most people, flu passes. For those with diabetes, heart disease or lung problems, it can turn serious quickly
H1N1 is once again putting doctors on alert, but the bigger concern is not the virus alone. It is the patient’s underlying health.For most healthy people, influenza settles within a week. But for people with heart disease, diabetes, asthma, COPD, cancer or a weakened immune system, flu can trigger serious complications. India’s National Centre for Disease Control lists people with chronic conditions and those at the extremes of age among groups at higher risk. Dr Ankit Mittal, Consultant in Infectious Diseases, AIG Hospitals, says influenza is far more than a respiratory infection. “In someone with heart disease, the combination of fever, a racing pulse and that inflammation places real strain on the heart,” he says. Flu can worsen heart failure and trigger serious cardiac complications.For people with diabetes, infection can send blood sugar soaring while weakening the body’s ability to fight the virus. In asthma and COPD, inflamed airways can mean worsening breathlessness and an increased risk of pneumonia.
THE NIGHTMARE CAN ESCALATE FAST
The highest-risk patients include those with chronic heart, lung or metabolic disease, pregnant women, young children, older adults and people whose immunity is suppressed by cancer treatment or transplantation. In immunocompromised patients, Dr Mittal says influenza can progress to severe viral pneumonia and respiratory failure within days.
KNOW WHEN FLU IS NO LONGER ‘JUST FLU’
Most cases can be managed at home. But watch for:
l Breathlessness or fast breathing
l Chest pain or pressure
l Bluish lips
l Persistent or returning fever
l Confusion or unusual drowsiness
l Severe weakness
l Repeated vomiting or inability to keep fluids down
l Falling oxygen levelsFor children, fast breathing, refusal to feed and unusual lethargy need urgent attention.
High-risk patients should contact their doctor early, even before severe warning signs appear.
DIABETES CHANGES THE GAME
Dr B Karthik Rao, Senior Consultant, Internal Medicine and Diabetologist, Medicover Hospital, says influenza can disrupt blood sugar dramatically.Stress hormones released during infection can increase glucose production and reduce insulin sensitivity. The result can be dehydration, severe hyperglycaemia and, in some cases, diabetic emergencies such as DKA or HHS.
His advice, monitor blood sugar more frequently, stay hydrated and check ketones when medically indicated. Medication changes should follow an individual sick-day plan or medical advice.
DON’T WAIT FOR THE TEST
Healthy adults with typical flu symptoms may not always need testing. In high-risk or hospitalised patients, nasal or throat swabs can help confirm influenza and identify the strain.But treatment should not necessarily wait for the result. The main antiviral used is oseltamivir, a prescription medicine. It works best when started within 48 hours, although doctors may still use it later in severe, progressive or hospitalised cases. Dr Mittal warns against two common mistakes: taking leftover antibiotics and self-medicating.Antibiotics do not treat influenza.
WHEN THE LUNGS TAKE A HIT
Dr Vijay Kumar Chennamchetty, Consultant Pulmonologist, Apollo Hospitals, says patients with asthma and COPD have less respiratory reserve. Influenza can trigger severe airway inflammation, worsening wheezing and breathlessness and sometimes progressing to pneumonia or respiratory failure. Serious cases may need oxygen, hospital monitoring, treatment for secondary infections and, in extreme cases, intensive respiratory support.
WHEN FLU STRIKES HEART
Influenza can be more than a routine viral fever for heart patients. Fever, dehydration, rapid heart rate and inflammation can put added strain on the heart, potentially worsening heart failure and triggering complications. Dr SomaRaju, Consultant Cardiologist and Mentor Director, Sindhu Hospital, says flu vaccination should be part of preventive cardiac care, especially for older adults and those with heart disease, diabetes or other chronic conditions. Since flu viruses change and immunity wanes, annual vaccination is generally recommended. Even when infection occurs, vaccination can reduce the risk of severe illness, complications and hospitalisation.
“If you have heart disease, diabetes, lung disease—or are over 65, don't think of the flu vaccine simply as protection against fever.Think of it as protection against the cascade that can turn an infection into a cardiac crisis.” — Dr Somaraju.
WHO IS AT RISK?
l Heart disease
l Diabetes
l Asthma and COPD
l Cancer treatment
l Transplant recipients
l Pregnancy
l Children under five
l Adults over 65
DEFENCE
l Vaccinate.
l Avoid close contact with sick people. Stay home when unwell.
l And keep underlying conditions under control.
l Take prescribed medicines and inhalers, monitor diabetes, and follow your doctor’s advice.
l Flu vaccination is especially important for high-risk groups.
l India’s health authorities recommend seasonal flu vaccination for people with chronic conditions.
