Tick activity has been high so far this year, with emergency department visits sparked by the pests reaching levels we ...

There are more than 2,000 species of tiny (0.04 to 0.15 inches), wingless, blood-sucking fleas that live on the body of the host they infest. Although fleas cannot fly, they have developed powerful ...

Add Yahoo as a preferred source to see more of our stories on Google. The last time you visited your doctor for a sore throat, they may have felt for potential inflammation in your neck. That’s ...

The CDC has released a new study on cat-scratch disease, often referred to as cat-scratch fever, aimed at better understanding the epidemiology of the disease to offer prevention tactics for those at ...

Swollen lymph nodes are often a sign that your body is fighting an infection. Autoimmune diseases can also cause lymph nodes ...

Allergies occur when your immune system overreacts to allergens like pet dander, pollen, mold, certain foods, or medications. Allergy symptoms may include a runny nose, congestion, coughing, wheezing, ...

While swollen lymph nodes are a common symptom of an allergy flare-up, they’re also associated with many other conditions. Swollen lymph nodes are a common immune system response. They’re most often ...