Category: harvardhealth_news_UNDEFINED

Several factors increase the risk for complications from COVID-19 or influenza and should prompt someone to request an antiviral medication as soon as possible, even if they have been vaccinated or have had the infections before. The risk factors are age (being 65 or older), an impaired immune system, and underlying conditions (especially heart or lung disease). Pregnant women also are at increased risk for severe influenza and COVID, and should consider taking an antiviral.

Radiation from diagnostic tests has the potential to damage tissue in the body, including cell DNA. Rarely, that can cause cell mutations that lead to cancer 10 or 20 years later. The long-term cancer risk from standard x-rays is considered very low; the risk from computed tomography (CT) scans might be higher. If a doctor orders a CT scan for someone who recently had that same type of scan, the patient should ask what the results might show, whether they’ll affect treatment, and whether an alternative test can be substituted.

In a 2025 randomized trial of about 1,000 people (ages 50 or older), followed for four years, those who took 2,000 international units of vitamin D₃ per day showed cellular signs that suggested they were aging more slowly compared with people who did not take the supplement. It’s unclear if this benefit would continue from taking daily pills longer than four years. Scientists do know that taking vitamin D₃ supplements is important for people with osteoporosis or with vitamin D deficiency (as determined by a blood test).

Someone with a new diagnosis of diabetes might feel overwhelmed by the many strategies required to help control the disease. It helps to add several experts to the care team. Soon after a diagnosis, it’s a good idea to schedule appointments with a dietitian, an eye doctor, an endocrinologist, and a certified diabetes educator. It’s also helpful to add other experts as needed to the team, such as a physical therapist, a podiatrist, a social worker or an aging life care manager, and a certified health coach.

In May 2025, the FDA approved the first blood test to detect the early stages of Alzheimer’s disease. The test looks for several proteins associated with Alzheimer’s disease. About 80% of the time, the blood test is either highly positive or highly negative, a result that’s accurate more than 90% of the time. Doctors expect that the test will soon be covered by insurance. If that happens, the test will become the standard of care for people ages 55 and older with Alzheimer’s signs or symptoms.

In a 2025 analysis involving about 200 million people, those who used cannabis had a 29% higher risk for sudden heart attacks or angina and twice the risk of premature death from cardiovascular disease, compared with people who didn’t use cannabis.

A 2025 study of more than 11,000 people (average age 55), followed for about four years, those who walked more than 100 minutes a day had a 23% lower risk of chronic low back pain, compared with people who walked less than 78 minutes per day.

A 2025 study that involved 125,000 people (ages 40 to 69), who were followed for about a decade, found that both the quantity and variety of flavonoid intake were linked with significantly reduced risks of chronic disease and death from any cause.

There are no medications to treat aortic stenosis (narrowing of the aortic valve), but several possibilities are currently being studied, including a class of drugs to treat diabetes and others that lower high lipoprotein(a) blood levels.

Tennis leg refers to a strained calf muscle, usually the gastrocnemius. A person can injure the muscle during activity when planting the foot down hard or suddenly changing direction. This might happen during sports, such as tennis, or even while walking or jogging. Mature athletes, who are prone to injury, are vulnerable to the injury. Treatment can involve resting, elevating, and icing the calf muscle; wearing a compression sock; taking painkillers; getting physical therapy; and having surgery.