A symptom that deserves attention
I'm losing weight, but I'm tired and weak. Is that normal?
Some reduction in energy can happen during the process, but persistent fatigue or significant weakness shouldn't be ignored.
Possible causes
Fatigue can have several origins
None of these can be confirmed without evaluation — this list is purely educational.
Insufficient calorie or protein intake
Iron, B12, or vitamin D deficiency
Dehydration
Insufficient or poor-quality sleep
Muscle mass loss
An effect of the medication itself
Thyroid changes or other clinical conditions
Stress and emotional overload
Seek medical evaluation if you notice
- Weakness that interferes with daily activities
- Fatigue that doesn't improve with rest and adequate sleep
- Frequent dizziness
- Heart palpitations
- Shortness of breath with light effort
- Fatigue combined with other new symptoms
Fatigue and weakness have many possible causes, and aren't always related to weight loss or the medication in use. Persistent symptoms need evaluation and, when indicated, lab work.