Unexplained weight loss means losing weight unintentionally without a clear change in diet or exercise. Because many body systems can be involved, clinicians evaluate medical history, a focused physical exam, and targeted tests to identify potential causes and plan appropriate referrals.
Clinicians typically flag unintended weight loss that occurs over weeks to months, especially if it represents a substantial percentage of body weight or is accompanied by other symptoms. Assessment considers the amount and speed of loss, appetite changes, age, chronic conditions, and recent life changes.
No single cause explains all cases. Frequent categories include metabolic and endocrine disorders (for example, thyroid overactivity), gastrointestinal malabsorption, chronic infections, cancer, chronic inflammatory diseases, psychiatric conditions (depression, eating disorders), medication effects, and age-related muscle loss (sarcopenia). Causes work through reduced intake, increased energy use, or impaired nutrient absorption.
Evaluation starts with a detailed history and examination. Initial tests often include basic blood work (complete blood count, glucose, kidney and liver markers), thyroid function tests, and markers of inflammation or infection when indicated. Imaging (ultrasound, X-ray, CT) and specialist referrals are used selectively based on initial findings.
Primary care or internal medicine usually lead the initial workup. Depending on findings, referrals may include endocrinology, gastroenterology, infectious diseases, oncology, psychiatry, or geriatrics. Dietitians and physical rehabilitation teams can help address nutritional needs and muscle preservation.
If weight loss is accompanied by high fever, severe pain, trouble breathing, fainting, signs of severe dehydration, or uncontrolled bleeding, seek emergency medical services promptly. These signs may indicate a condition requiring immediate attention.
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