Hypergonadism

Hypergonadism is an intersex condition where there is a hyperfunction of the gonads. It can manifest as precocious puberty, and is caused by abnormally high levels of testosterone or estrogen, crucial hormones for sexual development.

It can encompass aromatase excess syndrome, hyperestrogenism, and hyperandrogenism.

Causes
These conditions can be caused by gene mutations, liver or kidney diseases, infections, surgical interventions, autoimmune disorders, horomonal abnormalities, injury to ones glands, and encephalitis.

It may also be caused by other intersex conditions.

Resources

 * https://www.healthline.com/health/hypergonadism#causes