Unexplained Weight Loss: When to Worry and What to Do
South Ken MD Team
Most people expect weight loss to follow changes in diet or exercise. But if the pounds are dropping off without you trying, it can be a cause for concern. Unexplained weight loss, generally defined as losing more than 5% of your body weight in six to twelve months without effort, may signal an underlying health issue.
"If you've noticed unintentional weight loss, don't wait to see if it improves on its own — arranging a medical review can provide clarity and peace of mind."
Common Non-Serious Reasons
Not all unintentional weight loss is linked to serious illness. Sometimes it's due to:
- Increased physical activity without adjusting food intake
- Stress or anxiety affecting appetite
- Minor infections that temporarily reduce eating
- Age-related changes in appetite or muscle mass
Important
However, persistent or significant weight loss should not be ignored. If you've lost more than 5% of your body weight without trying, it's time to seek medical advice.
Medical Causes to Be Aware Of
A range of health conditions can contribute to unexplained weight loss, including:
Thyroid Disorders
An overactive thyroid can speed up metabolism and cause weight loss.
Diabetes
Uncontrolled blood sugar may lead to sudden weight changes.
Digestive Conditions
Problems like coeliac disease, inflammatory bowel disease, or chronic infections can reduce nutrient absorption.
Cancer
In some cases, unexplained weight loss can be an early warning sign.
Depression or Mental Health Conditions
Loss of appetite is a common symptom of depression and other mental health conditions.
Concerned about unexplained weight loss? Book a consultation with our medical team for a thorough assessment.
Book Health ScreeningWhen to See a Doctor
Seek medical advice promptly if your weight loss is:
- More than 5% of your body weight within six months
- Accompanied by fatigue, night sweats, or fever
- Linked to changes in bowel habits or abdominal pain
- Associated with loss of appetite or difficulty swallowing
What Tests Might Be Recommended
To investigate unexplained weight loss, a healthcare professional may suggest:
- Blood tests – To check thyroid function, diabetes, infection, or vitamin levels
- Stool tests – To look for signs of inflammation or infection
- Imaging scans – If more detailed investigation is needed
- Specialist referrals – Depending on symptoms and test results
Our Services
At South Kensington Medical & Dental, we offer Comprehensive Health Screening and targeted Blood Tests to help identify underlying causes of unexplained symptoms.
Taking Action Early
The cause of unexplained weight loss is not always serious, but identifying the reason early can make a big difference. Even if tests show no major condition, having reassurance and guidance on improving nutrition and lifestyle is valuable.
Final Thoughts
Weight loss without trying can feel unsettling. While it sometimes results from stress or minor illness, it can also be the body's way of signalling something more significant.
If you've noticed unintentional weight loss, don't wait to see if it improves on its own — arranging a medical review can provide clarity and peace of mind.
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