Fitness basics
Learning Center
Primary lateral sclerosis (PLS)
This motor neuron disease causes nerves within the brain to slowly break down. It causes muscle weakness primarily in the legs, arms and tongue.
Primary immunodeficiency
Frequent infections could mean you have an immune system disorder. The conditions in this category are usually caused by genetic changes.
Prader-Willi syndrome
Prader-Willi syndrome is a rare genetic disorder that results in physical, mental and behavioral problems, including a constant sense of hunger.
Polio
Learn more about this contagious viral illness that affects the nervous system. Severe disease can lead to paralysis, trouble breathing and sometimes death.
Plantar warts
Learn about the causes, treatment and prevention of these hard, sometimes painful growths that appear on the heel or ball of the foot.
Pituitary tumors
Learn more about the symptoms, causes and treatment of growths that develop in the pituitary gland.
Pinworm infection
Learn more about the symptoms, treatment and prevention of this common type of intestinal worm infection.
Pink eye (conjunctivitis)
This highly contagious eye condition can be itchy and uncomfortable. But much like the common cold, it rarely requires medicine or staying home.
Pineoblastoma
Learn about this rare cancer that begins in the brain's pineal gland. Treatments include surgery, radiation therapy and chemotherapy.
Phenylketonuria (PKU)
PKU is caused by a change in the gene that helps create an enzyme needed to break down phenylalanine. Treatment includes a special diet and medication.
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