Health
Study Finds One-Third of Global Cancer Cases Could Be Prevented by Controlling Risk Factors
A new study published in Nature Medicine on Tuesday shows that nearly 40 percent of new cancer cases worldwide could be prevented by managing common risk factors such as smoking, alcohol use, and infections. The research, released ahead of World Cancer Day, analyzed 36 types of cancer across 185 countries using data from 2022 and examined 30 modifiable risk factors that can be controlled or managed to reduce the likelihood of developing the disease.
The study found that tobacco use remains the leading contributor to cancer globally, followed by infections and alcohol consumption. Out of the 18.7 million new cancer cases recorded in 2022, about 7.1 million, or 38 percent, were linked to preventable causes. Stomach, lung, and cervical cancers accounted for nearly half of these avoidable cases.
Smoking was responsible for approximately 15 percent of preventable cancers, making it the single largest risk factor worldwide. Infections, including human papillomavirus (HPV), contributed to around 10 percent of cases, while alcohol consumption accounted for three percent.
Regional differences were evident in the data. In low- and middle-income regions, such as sub-Saharan Africa, infections were the leading contributor to preventable cancers, with cervical cancer being particularly prevalent. In contrast, in high-income regions such as Europe and North America, smoking was the primary factor driving cancer cases among women. Smoking also remained the top risk factor among men globally, responsible for nearly 25 percent of 4.3 million avoidable cases. Infections were the second leading cause of cancer among men, especially in Asia, Africa, and South America.
Among the 9.2 million new cancer cases in women, roughly 30 percent were considered preventable. Infections such as HPV were linked to over 11 percent of these cases, highlighting the importance of vaccination and early detection programs in vulnerable regions.
The research also considered population-level exposure to each risk factor, showing how the number of cases varied across regions based on lifestyle, healthcare access, and public health interventions. Previous studies often focused on single risk factors or mortality, but this study provides a more comprehensive view of cancer incidence globally and the proportion that could be avoided through preventive measures.
Researchers say the findings could help guide more targeted cancer prevention strategies. By identifying the most significant risk factors in different regions, policymakers and health organizations can design interventions tailored to local needs rather than applying a one-size-fits-all approach.
“This study underscores the potential for prevention in reducing the global burden of cancer,” the authors said. “Addressing smoking, infections, and alcohol consumption could prevent millions of cases each year and save countless lives.”
Health
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
Europe Records Sharp Rise in Sexually Transmitted Infections, ECDC Warns
Health
White House Rejects Report It Blocked Return of Ebola-Infected US Doctor
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