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Low white blood cell count
Learn the causes of this decrease in disease-fighting cells in the blood.
Lymphocytosis (high lymphocyte count)
A brief increase in certain white blood cells, called lymphocytes, is typical after an infection. Too high a count can mean something more serious.
Muscle pain
Muscle pain: Symptom — Overview covers definition, possible causes of this symptom.
Nasal congestion
Learn more about what can cause a stuffy nose and how to relieve it.
Nausea and vomiting
Motion sickness and drinking alcohol are among the many common causes of nausea and vomiting. Serious diseases can also have this effect.
Neck pain: Symptom
Stress, strain and sitting for long hours at a computer are some of the many causes of this common pain.
Neutropenia (low neutrophil count)
Neutropenia: Symptom — Overview covers definition, possible causes of a lack of certain white blood cells.
Night leg cramps
Find out about this common nighttime pain in the calf, foot or thigh and how to ease it.
Night sweats
Learn what conditions and medications might cause these sleep-disturbing sweats.
Nipple discharge
Fluid leaking from the nipples isn't often a sign of breast cancer. Learn more about the possible causes and when to see a doctor.
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