Understand what causes bent and painful erections and learn what treatments are available.
Disease
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.
Disease
Pheochromocytoma
Find out more about the symptoms, causes and treatment of this rare adrenal gland tumor, which usually is not cancer.
Disease
Pilocytic astrocytoma
This slow-growing brain tumor is most common in children and teens. Find out the symptoms, causes, diagnosis, treatment options and prognosis, plus answers to common questions.
Disease
Pilonidal cyst
Learn about causes, symptoms and treatments of this painful condition that usually affects the skin above the tailbone in people who sit for long periods.
Disease
Pinched nerve
Pressure on a nerve can lead to numbness, tingling or pain that’s often improved by resting the area.
Disease
Pineal gland tumor
Learn about tumors that affect the pineal gland, including types, symptoms, diagnosis, treatment options, recovery and long-term outlook.
Disease
Pineoblastoma
Learn about this rare cancer that begins in the brain's pineal gland. Treatments include surgery, radiation therapy and chemotherapy.
Disease
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.
Disease
Pinworm infection
Learn more about the symptoms, treatment and prevention of this common intestinal worm infection.
Disease
Pituitary tumors and adenomas
Learn more about the symptoms, causes and treatment of growths that develop in the pituitary gland.
Disease
Pityriasis rosea
Learn more about the symptoms, causes and treatment of this large rash common among teens and young adults.