Immune and infectious diseases Archive

Postural orthostatic tachycardia syndrome (POTS) is a condition characterized by lightheadedness or dizziness when standing and a racing heart. The underlying cause is not known, although it sometimes follows bedrest after injury or illness. Recently, POTS has been diagnosed in some people who have had COVID-19.

Blood in the urine is often due to a urinary tract infection or kidney stones, but it might also indicate a more serious problem. To determine the cause, doctors start by analyzing a urine sample. Other tests may include imaging scans or cystoscopy to look inside the bladder.

The US is seeing an unusual spike in the mosquito-borne illness dengue fever. What is dengue, and where is it occurring in the US? How does it spread? And what steps can you take to protect against this and other mosquito-borne illnesses?

A 2024 study found that people who exercise regularly are much less likely to get COVID-19 or be hospitalized with it, compared with people who don't exercise regularly. That's because exercise keeps the immune system strong and able to fight off infection. Exercise enhances the ability of white blood cells to do battle; stimulates the production of antibodies in the lining of the nose, throat, breathing tubes, and lungs; and keeps the immune system from overreacting to infections and harming the body.

Two-thirds of Americans with long COVID are women. Women approaching menopause who have long COVID seem to experience worsened symptoms of both conditions. Women's sex hormones appear to contribute to this phenomenon. Hormone therapy is becoming both a treatment and a diagnostic tool to determine driving factors behind affected women's symptoms. Because symptoms overlap, some women may have trouble being correctly diagnosed with perimenopause or long COVID.

Guidelines advise unvaccinated people at high risk for severe COVID to take Paxlovid (nirmatrelvir with ritonavir) soon after symptoms begin. However, a 2024 study suggests that people who are vaccinated and high-risk or unvaccinated and low-risk don't need to do so.

Migraines and cardiovascular disease share certain common features, including changes in blood vessels, blood flow, and inflammation. Migraine with aura is linked to an increased risk of stroke, and common migraine drugs called triptans are linked to a higher risk of stroke and heart attack in people at risk for cardiovascular disease. Although both of these risks are extremely small, migraine sufferers with heart-related risks should seek out a personalized approach for treatment and know the warning signs of a stroke.