Many relationships are complicated, but the link between HIV and other sexually transmitted infections (STIs) is straightforward: You're more likely to get HIV if you have another STI.
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Asthma affects about 5.5 million children nationwide—but the burden doesn't fall equally. One study found that kids in neighborhoods with more crime and lower education levels had greater odds of going to the hospital with an asthma-related problem.
The holidays can be stressful. This time of year may find you feeling lonely, sad, or angry. These feelings are normal, but there are ways to ease them and adopt a more positive outlook.