Why Cancer Cells Grow Most Often In The Left Breast?

While some researchers are still trying to solve the mystery, data from Nature reveals that breast cancer in the left breast may be because it hosts slightly more aggressive tumours or shows nuanced biological differences. Let's unpack the other reasons.

Ever wondered why breast cancer occurs most often in the left breast? While researchers are trying to solve the mystery, some suggest it could be the size of the breast, habits of breastfeeding, self-examination or even biological quirks. Data available in a publication in Nature highlights that the possible cause of breast cancer in the left breast may be because it hosts slightly more aggressive tumours or shows nuanced biological differences.

Breast Cancer In The Left Breast

The US National Cancer Institute's SEER program also pointed out that among 8,80,000 people who reported the chronic disease, 50.8% of cases occurred in the left breast, with only 49.2% on the right. A Nature-packed study revealed that left-sided tumours may be linked to severe outcomes, or even genes tied to cell growth may be more active in the left breast.

Possible Theories To Fuel The Common Beliefs

1. Self-examination: One of the main reasons why most people detect breast cancer easily on the left side could be due to the advantage of the right hand.
2. Left breast slightly larger: Although direct evidence is limited, the subtle size difference of the left breast could hold more tissue, increasing the risk.
3. Breastfeeding habits: Some breastfeeding mother often feed their child on the right breast, which may result in the left breast being emptied less often. This habit can make it difficult to detect any lumps on the left breast.
4. Differences at the cellular level: Researchers believe that the left side of the breast may have a higher number of undifferentiated cells that are prone to cancer.
5. Random variation: The chance of breast cancer occurring in the left breast could just be random.

Debunking Myths Around Breast Cancer

Let's debunk some myths around the

Myth 1: Only one-sided breast is ever affected by the cancerous cell

Fact 1: No, breast cancer can occur in either one side of the breast or in both across time. The random variation of the left breast preference doesn't guarantee safety on the right.

Myth 2: Deodorants or antiperspirants are dangerous

Fact 2: There are no credible links associated with aluminium-based deodorants to breast cancer.

Myth 3: Lumps Are Always Painful

Myth 3: No, lumps are often painless and unnoticed. Early signs of breast cancer may include skin changes, nipple inversion, or redness. Cancer Center outlines, "Although most breast lumps are painless, some may hurt. It's impossible to tell whether a breast lump is cancerous based on whether it's painful or not, so it's essential to see a doctor if any lumps are detected."

Myth 4: Men do not develop breast cancer

Fact 4: Although it is rare, breast cancer is not limited only to women. Men can also develop cancer cells in the breast tissues. The CDC explains, "Breast cancer is most often found in women, but men can get breast cancer too. About 1 out of every 100 breast cancers diagnosed in the United States is found in a man."

Myth 5: Left breast cancer means only worse survival

Fact 5: Not always. The seriousness of breast cancer totally depends on the stage, tumour type and treatment approach.

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