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There are times when your weight noticeably decreases over several months, even without significant changes in your diet or activity level. While you might initially dismiss it as a natural change, if unexplained weight loss continues, it's important to investigate the cause.

When blood sugar levels become excessively high, the body cannot adequately use glucose as an energy source and may instead use stored fat and muscle, which can lead to weight loss. If you experience weight loss even though your food intake hasn't decreased, and it's accompanied by increased thirst, more frequent urination, and easy fatigue, it's advisable to check for diabetes with a blood sugar test.

Weight loss can also occur with hyperthyroidism, a condition where the thyroid gland becomes overly active. As metabolism speeds up, you might lose weight even while eating more than usual, and this can be accompanied by heart palpitations, hand tremors, severe heat intolerance, and increased sweating. In such cases, a thyroid hormone test can check for functional abnormalities.

If your appetite has decreased and you're eating less, it's also important to consider issues with your digestive system. Persistent indigestion, abdominal pain, diarrhea, and nausea can make it difficult to get adequate nutrition, leading to weight loss. If you have difficulty swallowing, feel full quickly after eating only a little, or experience bloody stools, black stools, or recurring abdominal pain, you should check if tests such as a gastroscopy or colonoscopy are needed.

Weight can fluctuate somewhat depending on hydration status or food intake, so a decrease of a few kilograms alone does not necessarily indicate a disease. However, if your weight decreases by approximately 5% or more of your usual weight within 6 to 12 months without a specific reason, it can be considered medically significant weight loss. In such cases, blood tests are used to check for anemia, blood sugar, and liver/kidney function, and additional tests such as thyroid or digestive system examinations may be added depending on the symptoms to identify the cause.

Unexplained weight loss can be a symptom of various health problems, not just diabetes, thyroid disorders, or digestive disorders. Rather than just looking at the number on the scale, it's advisable to consider when and how much weight you've lost, whether there are changes in appetite and bowel habits, and if there are new symptoms like fatigue or thirst, and then identify the cause with necessary tests.

This article is intended to provide general health information, and the causes and necessary tests may vary depending on an individual's condition. If symptoms persist, please consult with a medical professional for diagnosis.