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For some people, the effects of the influenza (flu) virus can lead to a heart attack or cardiac arrest (sudden death). These people typically have reduced blood flow to the heart due to atherosclerosis (narrowed arteries). Because the flu can cause blood oxygen levels to drop to dangerously low levels, it can further reduce the supply of oxygen to the heart, causing a heart attack or cardiac arrest. Fortunately, getting an annual flu shot is associated with reduced risks of a heart attack and related cardiac events.

Sinusitis occurs when blocked sinuses cannot drain and the backed-up mucus gets infected. The simplest and often most effective treatment is daily nasal irrigation. It can also help to drink a lot of water, inhale steam, and sleep with the head elevated.

A persistent cough that lasts longer than a few weeks can be worrisome, but for nonsmokers, the most common causes include asthma, bronchitis, gastroesophageal reflux disease, and medication for high blood pressure.

A recent analysis found evidence mixed on whether zinc can help prevent or treat a cold. However, there appears to be no significant harm from taking over-the-counter zinc products in safe amounts per the label's instructions.

Millions of Americans get influenza during most flu seasons. Good hygiene habits can help you avoid catching the virus, and a flu shot can substantially reduce your risk as well.

Ask the doctors

Q. I'm debating whether I need to get a flu shot this year. Do you think it's worthwhile?

A. The answer to this question is an emphatic yes. It's more important than ever to get a flu shot this year for a number of reasons. First, it will reduce your likelihood of contracting, being hospitalized for, or dying from influenza, which should be reason enough to roll up your sleeve. In addition, if you do get sick with the flu after being vaccinated, the vaccine can reduce the severity of your illness.

Research we're watching

Serious heart complications are common in people hospitalized with influenza, according to a study published online Aug. 25, 2020, by Annals of Internal Medicine.

Researchers from the CDC looked at the rates of cardiovascular problems in more than 80,000 adults hospitalized with a confirmed case of influenza (commonly called the flu) from 2010 to 2018. Almost 12% had a serious cardiovascular problem, most commonly heart failure or a lack of adequate blood flow to the heart, known as acute coronary syndrome. The body's immune response against the infection can trigger inflammation and other changes that harm the cardiovascular system.

These three remedies may reduce symptom duration and severity.

While there's no cure for the common cold, everyone seems to have a surefire remedy they embrace.

Some of the popular ones are sucking on zinc lozenges, boosting your vitamin C intake, and even slurping up steaming bowls of old-fashioned chicken soup.

In the journals

If winter brings you a sore throat and coughing, a spoonful of honey can be quite soothing. And it might even reduce symptoms from an upper respiratory tract infection, suggests a review of studies published online Aug. 18, 2020, by BMJ Evidence-Based Medicine. Upper respiratory infections (such as colds) are viral illnesses that affect the nose, throat, voice box, and large airways that lead to the lungs. Symptoms include a stuffy nose, congestion, sore throat, and cough. Researchers reviewed 14 studies of almost 1,800 people with upper respiratory infections being treated with either honey or usual methods (antihistamines, expectorants, cough suppressants, and painkillers). Honey appeared to improve symptoms (especially cough frequency and severity), and in some cases shorten the duration of symptoms by a day or two. The findings were only observational and don't prove honey is a cure. But honey has antimicrobial properties, and scientists say that in adults (but not in kids age one or younger), it's a harmless way to address symptoms.

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