John William Klinefelter, aged 83, of Great Falls, Montana, passed away on January 13, 2026, after a courageous battle with pancreatic cancer. He was surrounded by family at Peace Hospice, where he ...

There's a new development in the yearslong international mystery over Havana Syndrome: The U.S. has obtained and has been testing a device that officials believe could be linked to the debilitating ...

The mystery of the so-called Havana Syndrome has stumped experts, intelligence officials and lawmakers for close to a decade. More than 1,000 officials and their family members are thought to have ...

NEW real-world evidence from a large multicentre Italian cohort suggests that baseline serum testosterone levels and testicular histology can meaningfully predict the likelihood of successful sperm ...

Comedian Amy Schumer, 44, has recently come clean about her struggle with Cushing’s syndrome, leading to a dramatic weight loss. Schumer's transformation has sparked conversation online, to which she ...

NEW research offers important clarity for patients with nonmosaic Klinefelter syndrome, addressing a long-standing debate about whether surgical sperm retrieval should occur early in adolescence or ...

Another critical research need involves understanding the effects of exogenous testosterone. In this interview, Leila Momtazi-Mar, of Cleveland Clinic Lerner College of Medicine in Cleveland, ...

Leila Momtazi-Mar notes that although some studies suggest a decline in retrieval rates after age 40, this association remains preliminary. In this interview, Leila Momtazi-Mar, of Cleveland Clinic ...

Long QT syndrome is a leading cause of sudden death in young persons, with a prevalence exceeding 1 in 2000. It is characterized by prolongation of the QT interval, aberrant T-wave morphologic ...

Klinefelter syndrome can cause problems with learning and sexual development in guys. It's a genetic condition (meaning a person is born with it). Klinefelter syndrome only affects males. It happens ...

Klinefelter syndrome is a fairly common genetic condition found in males only. Many boys with Klinefelter syndrome — also known as XXY syndrome — have no signs or symptoms, and some don't even know ...