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Testosterone replacement therapy can improve symptoms for men with confirmed low testosterone, but it can also switch off the hormonal signals needed to make sperm. For men who want children now or in the future, that trade-off matters.

Learn about low sperm count and oligospermia, including common causes, diagnosis, treatment options and when low sperm count may require fertility treatment.

Learn how testosterone affects male fertility, why testosterone replacement therapy can reduce sperm production and what men trying to conceive should know.

Obesity and low testosterone often appear together, but many people do not realize how closely they are connected