Mr. Hung, 54, had a painless lump in his neck, which he thought was due to inflammation; now the lump is larger, and doctors diagnosed metastatic thyroid cancer.

Khang, 18, experienced chest pain, fatigue with exertion, and shortness of breath, leading doctors to diagnose a malignant tumor in his chest that had metastasized to his lungs.

Ms. Chinh, 41, experienced a low-grade fever in the afternoons, bloating, and heartburn for three months, initially mistaking it for a digestive disorder; however, doctors diagnosed a malignant stomach tumor with metastatic lymph nodes.

Ms. Hoa, 62, experienced sudden numbness and weakness on one side of her body, initially suspected to be a stroke, but doctors diagnosed metastatic lung cancer to the brain, liver, kidney, and bone.

Mr. Minh, 55, was diagnosed with early-stage colon cancer but opted for traditional medicine instead of conventional treatment; six months later, the cancer had metastasized to his liver.

Hung, 29, experienced a painless swelling on the left side of his neck. Doctors diagnosed him with thyroid cancer that had metastasized to the cervical lymph nodes, and surgery was performed to remove the tumor while preserving the laryngeal nerve.