Weight gain

Weight gain can develop slowly over months or appear more quickly. This page explains common reasons for increased weight, what information is useful in an initial clinical review, and which specialties may be involved in follow‑up. It is for general informational purposes only and not a substitute for professional medical assessment. If you experience sudden shortness of breath, chest pain, fainting, or rapid swelling, seek emergency care.

Common causes of gaining weight

Many cases are related to energy balance — consuming more calories than are used. Other contributors include reduced activity with age, changes in sleep or mood, pregnancy, certain hormonal or metabolic conditions (for example, thyroid problems or Cushing‑like syndromes), medications, fluid retention (edema) and changes in eating behaviour.

What to report at a first visit

A clinician will usually ask about timing and speed of weight change, diet and appetite, physical activity, sleep patterns, recent life changes or stressors, current medications and any other symptoms such as breathlessness, swelling, frequent urination or marked fatigue. Clear information about these topics helps guide whether blood tests or imaging are needed.

Possible tests and specialist referrals

Initial evaluation often starts with simple measurements and blood tests to check metabolic and hormonal status and organ function. Based on findings, your primary care clinician may refer you to Endocrinology, Cardiology, Nephrology, Nutrition and Dietetics, or Mental Health services for further assessment and support.

Lifestyle approaches and prevention

For many people, long‑term weight management focuses on regular physical activity, balanced nutrition, sleep quality and stress management. Personalised, sustainable changes—often with input from a dietitian or exercise professional—are more effective than short‑term fixes.

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Frequently asked questions

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