Cancer is a large group of diseases that can start in almost any organ or tissue of the body when abnormal cells grow uncontrollably, and go beyond their usual boundaries to invade adjoining parts of the body. According to the World Health Organization (WHO), it is the second most common cause of death globally, accounting for millions of deaths every year. Lung, prostate, colorectal, stomach and liver cancer are the most common types of cancer in men, while breast, colorectal, lung, cervical and thyroid cancer are the most common among women. However, these are not necessarily the deadliest forms of cancer.

What makes cancer the deadliest depends upon how many people have it and what percentage of those people actually survive. Cancer researchers determine this on the basis of five-year relative survival. This is the percentage of people who are expected to survive the effects of a given cancer, excluding their risk of other possible causes of death, for five years past a diagnosis. It is also important to note that what makes cancer really deadly is that practically no cure for it. A cure for cancer would imply that there are no cancerous cells remaining in the body.

Here are the 5 deadliest cancers in the U.S., according to SEER five-year relative survival data for cases diagnosed between 2014 and 2020.

1. Pancreatic cancer occurs when cells in your pancreas, a gland in your abdomen that aids digestion, mutate and multiply out of control, forming a tumour. Major risk factors include smoking, obesity, diabetes, chronic pancreatitis, certain genetic mutations and environmental chemical exposure.

2. Esophageal cancer develops in the oesophagus, which is the tube that connects your throat to your stomach.

3. Liver cancer and intrahepatic bile duct cancer originate in the liver or bile ducts, often linked to hepatitis infections, heavy alcohol use, obesity, and aflatoxin exposure.

4. Lung and bronchus cancer primarily caused by smoking, secondhand smoke, and environmental pollutants, affects the lungs and airways, making it the leading cause of cancer death in the US.

5. Acute myeloid leukaemia (AML) is an aggressive blood and bone marrow cancer that progresses rapidly, often linked to genetic mutations, radiation exposure, and certain chemicals.

ALSO READ: Why Are Lifestyle Factors Making Millennials Vulnerable To Cancer?

Aids Day, a day that focuses on raising awareness on a disease that effects 40.8 million lives. In 2024 alone, 630,000 people died from AIDS-related deaths. What really is AIDS? It stands for acquired immunodeficiency syndrome, which is an advanced stage of HIV, caused by the human immunodeficiency virus. It damages the immune system so that the body is less able to fight infections and diseases.

Thus, every year, on December 1, World AIDS Day is observed to increase awareness on the same, provide support to people living with it and remember those who have lost their lives to the illness.

World Aids Day 2025: Theme

This year, the theme for Aids Day is "Rethink, Rebuild, and Rise".

The International AIDS Society (IAS) wants to create a simple message through the theme that it is important for everyone to connect and work against HIV. This is an urge to everyone from local activists to scientists, to governments, and to the global organization.

The world’s fight against HIV is entering a critical phase. Hard-won progress is under threat as political tensions grow and funding becomes uncertain. This year’s theme, “Rethink. Rebuild. Rise.” is a powerful reminder that the global community must stay united, resilient and forward-thinking to meet the challenges ahead.

Rethink calls for stronger, long-term financial planning. It urges countries to invest more of their own resources instead of relying mainly on international support.

Rebuild highlights the need to strengthen health systems, protect scientific research and support civil society groups. It also emphasizes grounding every decision in solid evidence and pushing back against misinformation.

Rise encourages the world to move ahead with a fully funded, people-centered strategy that safeguards past achievements and brings us closer to ending AIDS as a public health threat by 2030.

Importance Of World Aids Day 2025

The United Nations notes that in 2025, funding crisis is threatening the progress made in the prevention of the illness. This is why this day is a reminder for more people to connect, initiate community services that are vital for the marginalized population who are often deprioritized while the rise in punitive law criminalizes same sex relationships, gender identity, and drug use that amplifies the crisis, and makes HIV-AIDS services inaccessible.

The global response to AIDS has been shaken in recent months, and much more work is needed to meet the Sustainable Development Goal of ending AIDS by 2030. The crisis is far from over, and in today’s challenging environment, a fresh, transformative strategy is essential to reduce risks and stay on track.

World Aids Day: Origin

The day was first observed in 1988 when the World Health Organization (WHO) and the United Nations first launched it to spread awareness about HIV/AIDS, erase misconception, and build empathy for people living with AIDS. This day reminds people around the world that AIDS is not only a health problem but also a social and humanitarian issue for which everyone should work together.

Can You Prevent AIDS?

The prevention of AIDS starts from the restriction and complete stoppage of HIV. While there is no vaccine or permanent cure yet, there are ways to prevent AIDS:

• Practice Safe Sex
• Don't Share Needles
• Prevent Mother-to-child Transmission
• Ensure Safe Blood Transfusions

Vaccine safety, a debate the Trump administration just cannot let go. Once again, the same debate is stirring up, and this time an internal Food and Drug Administration memo that The New York Times obtained has linked death of at least 10 children to the COVID vaccine. While the document has not been released publicly, it has already caused controversy and prompted talk of tighter regulations.

The New York Times however reports that the memo did not include essential such as the ages of the affected children, any underlying health conditions, or how the agency reached its conclusions. It also did not identify which manufacturers’ vaccines were involved. Since the findings have not been published in a peer-reviewed journal, many critics of Health Secretary Robert F. Kennedy Jr. have raised concerns about the accuracy and timing of the claims. Kennedy has long questioned the safety of Covid shots, even as scientific consensus maintains that vaccines are safe and have saved countless lives.

So, What Does The Memo Say About Vaccination And Death Of Children?

Dr Vinay Prasad, who is the head of FDA's vaccine division wrote the memo based on the findings of a review of reports that suggested that the deaths were linked to myocarditis, which is a rare inflammation of the heart muscle.

But, what does the science say? Scientists have studied the connection between Covid vaccines and myocarditis for years, especially among teenage boys and young men. Most studies have shown that the condition is rare and usually resolves quickly.

Even so, Dr Prasad wrote to staff that the memo marked the first time the FDA would acknowledge that Covid vaccines may have played a role in the deaths of American children. He indicated that he would propose several new oversight measures. It is unclear whether the White House had been briefed on these plans or how closely officials would follow them. When The New York Times reached out to Department of Health and Human Services for a comment, the request was declined.

A Shift In Vaccine Policy

This memo comes at the time when the administration has already taken a more cautious stance on vaccines. Kennedy's team has already introduced new limits on who can or cannot receive COVID shots. The shot has now been restricted to people over 65 and younger individuals with medical vulnerabilities. Officials have also called for renewed studies on long-established vaccines that have been considered safe for decades.

Public health experts from previous administrations have warned that casting doubt on vaccines could have serious consequences. Covid has killed more than a million Americans, including about 2,100 children. Experts note that many more lives were saved because vaccines became widely available.

What Are The Experts Saying?

The memo appeared just before a significant upcoming meeting of the CDC’s vaccine committee, which now includes members known for supporting the medical freedom movement. Michael Osterholm, an infectious disease specialist, said the timing did not seem accidental and called the release “irresponsible.”

Other experts expressed concern that the memo lacked important context. Dr. Paul Offit of the Children’s Hospital of Philadelphia pointed out that myocarditis from Covid infection itself has been far more severe than the rare cases linked to vaccines.

Dr. Prasad also criticized previous mandates for school and workplace vaccination, claiming they pressured people into receiving shots that might pose risks. His memo ended by addressing internal disagreements within the agency and outlining how staff should resign if they oppose the new direction.

Delhi woke up to a slightly lower levels of AQI on Sunday Morning, November 30, as city's AQI dropped to 269 at 7am down from 305, which was recorded at 4pm on Saturday. This now falls under the "poor" category. However, experts say that the relief is temporary.

Many health experts and those who have studied the impact of pollution on humans have pointed out that anything above 300 is harmful to humans. These harms are not just limited to respiratory illnesses, and to lungs, causing lung cancers, but can also be the reason why obesity is on the rise.

Can Air Pollution Cause Obesity?

As per a 2021 study titled Effect of Air Pollution on Obesity in Children: A systematic Review and Meta-Analysis, there is a connection between air pollution and weight gain through biological behavioral mechanism. The major pollutants causing obesity are nitrous oxides, nitrogen dioxide, ozone, and particulate matter.

These could lead to systematic inflammation and metabolic disturbances, which can lead to weight gain and obesity. The study mentions that fine particulate matter [PM2.5], when it enters our body, it influences the metabolism rates.

The 2021 study also revealed that increase in air pollution, and road traffic noise was also associated with childhood obesity.

Also Read: 'Facing Breathing Issues After Morning Walk' Says CJI Surya Kant As Delhi's Toxic Air Worsens

Another 2011 study titled The influence of air pollution on cardiovascular and pulmonary function and exercise capacity: Canadian Health Measures Survey (CHMS), found that air pollutants may indirectly impact body weight by raising the risk of chronic conditions like blood pressure, heart diseases or lung diseases. "Exposure to higher concentrations of air pollution was associated with higher resting blood pressure and lower ventilatory function. Ozone was associated with reduced exercise capacity," researchers of the study wrote.

The latest study published in 2024 titled The association between air pollution and obesity: an umbrella review of meta-analyses and systematic reviews, found that air pollution can impact metabolic function by influencing inflammation in fat tissue. It leads to an increase in oxidative stress and alters one's dietary habits.

Pollution And Women's Health

This does not end here, air pollution could also negatively impact women. As Dr Anuradha Kapur, Principal Director (Obstetrics & Gynaecology) and Head of Unit, Max Smart Super Speciality Hospital, Saket says, "Environmental pollutants, such as pesticides and microplastics, can affect reproductive health and hormone regulation, potentially impacting menstrual cycles."

Dr Sonam Simpatwar, Gynaecologist with a diploma in reproductive medicine, practising at Central Railway Hospital, Mumbai further explained how pollutants impact women's health:

Endocrine Disruptors: Chemicals found in pollution, plastics, and pesticides can mimic or interfere with hormones, potentially affecting menstrual cycles.

Climate Change: Rising temperatures, extreme weather events, and changes in water quality can impact food production, nutrition, and overall health, which can indirectly affect menstrual health.

Stress: Environmental stressors, such as pollution and climate change, can lead to increased stress, which is known to influence menstrual cycles.

"It's important to note that these are potential factors, and more research is needed to fully understand their impact on menstrual health," she said.