Fitness basics
Learning Center
X-linked agammaglobulinemia
This genetic disease weakens the immune system, mainly in males, and leads to having infections often.
Meningitis
Spot the signs and understand the treatment options for meningitis, an infection that has several possible causes.
Heart valve disease
Learn about this condition in which one or more of the heart valves doesn't work properly.
Conjoined twins
If an early embryo only partially separates and two babies develop, they remain physically connected — most often at the chest, abdomen or pelvis.
Erectile dysfunction
Understand what can cause the inability to get and keep an erection firm enough for sex and the possible treatment options.
Delayed ejaculation
Learn what can cause delayed or absent ejaculation and how it can be treated.
Coronavirus disease 2019 (COVID-19)
Coronavirus disease 2019 (COVID-19) is an illness caused by the virus SARS-CoV-2. Learn more about the symptoms, risks and ways to protect yourself.
Toxoplasmosis
Learn about symptoms, causes, treatment and prevention of this parasitic infection that can cause severe disease.
Chiari malformation
Learn about this brain condition in which brain tissue extends into the spinal canal.
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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