Ms. Chuyen, 73, experienced muscle weakness, shortness of breath, heart palpitations, back pain, and lost 4 kg in one month, leading doctors to diagnose hyperthyroidism causing heart failure.

Chi Hoa, 40, experienced fatigue, loss of appetite, and swollen lymph nodes in her neck, leading doctors to diagnose prolonged hypercalcemia caused by a parathyroid adenoma.