Medically reviewed by Benjamin Leach, MD Key Takeaways Lymphocytes are white blood cells that help protect the body from ...

Dear Dr. Roach: I am a female and almost 75 years old. My vital signs are always normal, and I am active, but slightly overweight. I get quarterly blood draws, and every reading is in the normal range ...

Causes include infection, cancer, and more ...

Patients had fewer lymphocytes in their blood. Alexander Raths/ Shutterstock Although Parkinson’s disease affects around 1%-2% of people over the age of 65, there is currently no cure. And by the time ...