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Parkinson disease is caused by a problem with a small area of your brain. This part of the brain helps control your movement and balance. For reasons that are not yet clear, cells in this part of the brain stop working.

Most insect bites cause only minor swelling or itching. But if you're allergic to insects such as wasps or bees, a sting can cause a life-threatening allergic reaction. Tick bites and poison from scorpions and certain spiders can be serious. Knowing when to get emergency care could save your life.

Learn all about tick bites, including removing a tick, common symptoms of tick-borne diseases, and when to get medical help after a bite.

You may feel curious or even a bit nervous about getting a vaccine to treat your prostate cancer. That’s understandable. This article gives details on this type of therapy and how it can affect your body.

Detailed information on hormones and their role in the workings of the endocrine system

Detailed information on the anatomy and function of the pituitary gland.

Lyme disease is an infection caused by the bacteria Borrelia burgdorferi. This spiral shaped bacterium is most commonly spread by a tick bite.

Learn about poisoning in children, including how to prevent poisoning and how to respond in an emergency.

Detailed information on spider bites, including symptoms and treatment.