Your lymphatic system filters waste, runs your immune defense and has no pump. Here's what doctors say keeps it moving.

Sick sinus syndrome (SSS) is a heart rhythm problem that affects your heart's natural pacemaker. You may develop symptoms of SSS like dizziness, fainting, and fatigue. Treatment may include lifestyle ...

From electronic health records and blood tests to the stream of data from wearable devices, the amount of health information people generate is accelerating rapidly. Yet, many users struggle to ...

Dear Dr. Roach: At age 76, I was diagnosed with sinus node dysfunction last year after several episodes of what I'd call being "spaced out" (for lack of a better term). I couldn't explain these ...

DEAR DR. ROACH: At age 76, I was diagnosed with sinus node dysfunction last year after several episodes of what I’d call being “spaced out” (for lack of a better term). I couldn’t explain these ...

Removing lymph nodes during cancer surgery has saved countless lives in many tumour types. Yet recent research is challenging parts of this long-standing practice. Imagine your body’s immune defences ...

Lymph nodes are a key part of the human immune system, whose primary function is to combat infections. The effectiveness of vaccines is based on their ability to trigger events in lymph nodes that ...

Lymph nodes are small, bean-shaped structures that are part of the lymphatic system. The lymphatic system helps the body fight infection and filter harmful substances. Lymph nodes are present ...

A new study shows that the sinoatrial node (SAN) -- a small but powerful structure in the human heart that serves as its natural pacemaker and initiates every normal heartbeat -- runs on different ...

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, ...