According to the data you provided (5 feet and 2 inches. and weight is 49.5 kilograms) your Body Mass Index (BMI) is approximately 19.8 which is in the lower part of the normal weight range (18.5-24.9).
However, this is normal range and if nothing is detected than it is just your normal body weight. No data was given about whether this has been your weight for awhile, or you experienced a sudden loss of weight. Loss of weight might be due to several reasons, including: thyroid gland hyperactivity, diabetes mellitus, and inadequate nutrient absorption.
Thyroid gland hyperactivity (hyperthyroidism) is a condition in which the thyroid gland produces higher amounts of thyroid hormones. These hormones accelerate the metabolism thus enhancing the catabolic processes in which the calories are burned and the weight is decreased subsequently.
During the initial period of diabetes mellitus, weight loss might be experienced due to similar metabolic processes.
You might want to visit an endocrinologist for a physical examination and hormonal laboratory tests for the thyroid gland condition and for diabetes mellitus. An ultrasound scan of the thyroid gland might be needed. If the result is positive for a nodule or is inconclusive, additional tests (thyroid scintigraphy) might be needed to detect whether the problem is primarily in the thyroid gland or is located elsewhere.
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