Oncologist reveals often-ignored cancer symptom: Unexplained weight loss

An oncologist has identified unexplained weight loss as a critical, yet often ignored, symptom that can signal the presence of cancer. Dr. Ketan Thanki, a colorectal surgeon at MemorialCare Todd Cancer Institute in California, explains that cancer often subtly manipulates the body's natural mechanisms, making early detection challenging. This can lead to symptoms that are easily dismissed as minor issues.

Thanki emphasizes that significant, unintentional weight loss, defined as losing more than 5% of total body weight within six to twelve months without changes in diet or exercise, should prompt immediate medical consultation. This is particularly crucial for individuals over 65. A loss of approximately 4.5 to 5 kilograms without a clear reason is a significant warning sign.

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Cancer generally hijacks natural bodily mechanisms rather than introducing foreign processes, which is why it's much harder for the body to even recognize that something is wrong.

This symptom is a "silent alarm" indicating substantial internal changes. According to the American Cancer Society, unexplained weight loss is frequently the first noticeable sign of cancers affecting the esophagus, pancreas, stomach, and lungs. In cases of ovarian cancer, weight loss may occur when a tumor grows large enough to press on the stomach, causing a feeling of fullness even after small meals.

The mechanism behind cancer-related weight loss is complex, involving a metabolic syndrome known as cachexia. Tumors release substances called cytokines that break down muscle and fat tissue, even with adequate calorie intake. This process, coupled with inflammation and increased energy expenditure by the tumor, disrupts appetite regulation and accelerates the loss of body mass, often occurring slowly and insidiously.

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It is necessary to visit a doctor if a person unintentionally loses more than five percent of their total body weight within a period of six to twelve months.