A major study involving more than 463,000 teenagers has uncovered a concerning connection between cannabis use and mental health. Researchers found that teens who reported using cannabis were approximately twice as likely to later receive a diagnosis of a psychotic or bipolar disorder, with younger teenagers appearing particularly vulnerable.

The leading preventable cause of stroke rarely gives any warning, and the latest numbers show just how many people walk past it unnoticed.

A major clinical trial involving nearly 2,750 people with type 2 diabetes has revealed surprising results for a new daily pill. Patients taking the medication lost weight, achieved better blood sugar control and had fewer deaths than those receiving insulin injections. However, scientists warn that the most dramatic finding needs further confirmation.

A major scientific review involving millions of people has uncovered a concerning connection between insomnia and serious health problems. Researchers found a 26% higher relative risk of stroke and 28% higher odds of hospitalization among people with insomnia, raising new questions about the long-term consequences of poor sleep.