With the research about cancer continually happening, medical experts learn more and more about the disease each day. Although several risk factors are said to cause cancer, below are some proven ones:


Fuel combustion generates hydrocarbons that are known to cause leukemia and lymphoma. Avoiding pollution in this day and age is almost impossible. However, what you can do is support people who are trying to protect the environment.

Cigarette Smoke

Apart from lung cancer, smoking can also cause bladder cancer, throat cancer, and esophagus cancer. Wondering how? It’s because toxins from smoke move through the bloodstream and are eliminated from the body through bile and urine. Due to this, smoking can cause cancer in almost any part of your body.

Moreover, tobacco isn’t the only carcinogenic product in cigarettes—the organic material burnt and inhaled is, too.

Charred Meats

Burning fats on meats like steak can convert them into carcinogenic chemicals.

Preserved Meats

Hot dogs and cold cuts are preserved for months using preservatives and nitrates that can cause cancer (colon cancer, in particular). The chemicals that form while the meat is preserved are carcinogenic as well.

Excess Body Weight

Increased weight means more fatty tissue, which is a major source of estrogen. Breast cancer is known to be caused by estrogen exposure. Colon cancer is also caused by excess body weight, but it’s more dependent on what you’re consuming rather than high body weight.

Ultraviolet Rays

Ultraviolet rays from the sun or tanning booths cause cancer. Melanoma is becoming one of the most common types of cancer. To keep yourself protected, wear a hat, sunscreen, and sun-protective clothes when you step outside.

Aside from these factors, there are also a few risk factors that can cause cancer. These include:


Drinking low quantities of alcohol (say, one or two glasses of wine per week) is not going to cause cancer. However, heavy consumption of alcohol could cause oral or stomach cancers.


There is no conclusive evidence that pesticides cause cancer, but farmers who inhale them while using them on crops are more likely to develop cancer. It’s a good practice to wash fruits and vegetables well before eating them to avoid the intake of any residual pesticides.

Artificial sweeteners are also said to cause cancer in humans, but there’s no concrete evidence to prove this.