Weight gain (patient information)

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Weight gain


What are the causes?

When to seek urgent medical care?

Treatment options

Where to find medical care for weight gain?

What to expect (Outlook/Prognosis)?

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Unintentional weight gain is when you gain weight without trying to do so. A continued weight gain occurs with pregnancy, whereas a periodic weight gain may occur with menstruation. A rapid weight gain may be a sign of dangerous fluid retention.

What causes weight gain?

Unintentional weight gain can be caused by many different things.

As you age, our metabolism slows down. This can cause weight gain if you eat too much, eat the wrong foods, or do not get enough exercise.

A medical problem or use of certain medication may also make you gain weight.

Medications that can cause weight gain include corticosteroids and drugs used to treat bipolar disorder, schizophrenia, and depression.

Hormone changes can also cause unintentional weight gain. This may be due to:

Bloating, or swelling due to a buildup of fluid in the tissues can cause weight gain. This may occur with menstruation, heart or kidney failure, preeclampsia, or certain medications.

If you quit smoking, you might gain weight. Most people who quit smoking gain 4 - 10 pounds in the first 6 months after quitting. Some gain as much as 25 - 30 pounds. This weight gain is not simply due to eating more.

When to seek urgent medical care?

Contact your health care provider if the following symptoms occur along with the weight gain:

Treatment options

Take action by starting a proper diet and exercise program. Counseling may be helpful.

Set realistic weight goals to maintain a healthy weight. Consult with a health care provider about specific measures.

Where to find medical care for weight gain?

Directions to Hospitals Treating Condition

What to expect (Outlook/Prognosis)?

Your health care provider will perform a physical examination, measure your height and weight to calculate your body mass index (BMI), and ask questions about your weight gain, such as:

  • Are you anxious, depressed, or under stress?
  • Did you gain the weight quickly or slowly?
  • Do you have a history of depression?
  • Do you use alcohol or street drugs?
  • Does the weight gain cause you much concern?
  • Has your participation in social activities decreased?
  • Has your physical activity been restricted due to illness or injury?
  • Have there been changes in your diet or appetite?
  • How much weight have you gained?
  • What medications do you take?
  • What other symptoms do you have?
  • When did the weight gain begin?

Tests that may be done include:

  • Blood tests including chemistry profile
  • Measurement of hormone levels
  • Nutritional assessment

Weight gain caused by emotional problems may require psychological counseling. Talk to your health care provider about an appropriate diet and exercise program and realistic weight loss goals. If weight gain is caused by a physical illness, treatment (if there is any) for the underlying cause will be prescribed.

If weight continues to be a problem despite diet and exercise, talk with your health care provider about other treatment options, including medications and surgery.


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