Unexplained Weight Gain
Understand possible causes, learn when to seek care, and find the right provider.
Overview
Gaining weight without changes to your diet or activity can signal a medical issue worth evaluating.
Common causes include thyroid problems, hormonal shifts, medication side effects, insulin resistance, stress, and poor sleep.
A primary care provider can order the right labs and, when useful, refer you for nutrition or endocrinology support.
Quick Symptom Assessment
Answer a few questions to get more relevant provider recommendations.
This assessment is for informational purposes only and does not provide a medical diagnosis. If you're concerned about your symptoms, contact a healthcare provider. In an emergency, call 911.
Possible Causes
Common reasons people experience unexplained weight gain. This list isn't exhaustive or a diagnosis.
Underactive thyroid
Hypothyroidism slows metabolism and often causes weight gain and fatigue.
Insulin resistance
Pre-diabetes and PCOS can drive weight gain, especially around the abdomen.
Medication side effect
Some antidepressants, steroids, and antipsychotics can cause weight gain.
Stress and poor sleep
High cortisol and short sleep both promote weight gain.
Menopause
Hormonal changes shift where the body stores fat and can slow metabolism.
Recommended Care
The right level of care depends on your symptoms. Here's where people with unexplained weight gain usually start.
Primary Care
Best first stop for most non-emergency symptoms. Your primary care provider can evaluate, order tests, and refer you if needed.
Telehealth
Talk to a provider from home. Convenient for mild symptoms, follow-ups, and quick guidance on next steps.
Find Care Near You
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See all unexplained weight gain centersWhen to Seek Immediate Care
Call 911 or go to the nearest emergency room if you experience any of the following:
- Rapid weight gain with swelling in legs or abdomen
- Shortness of breath with weight gain
- Severe fatigue, hair loss, or feeling cold
- Weight gain with irregular periods and acne
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