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Why would someone gain a lot of weight quickly?
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Dr. Robert Kwok
Pediatrics
In brief: A medical problem?
Significant weight gain over a week or two is usually a medical problem in which a person is holding too much water in his body.
Weight gain over a few weeks can be water retention, excessive eating, a fast-growing tumor, or a pregnancy. A person with a significant weight increase should see a doctor for a full evaluation, because sometimes the cause is a serious medical problem.

In brief: A medical problem?
Significant weight gain over a week or two is usually a medical problem in which a person is holding too much water in his body.
Weight gain over a few weeks can be water retention, excessive eating, a fast-growing tumor, or a pregnancy. A person with a significant weight increase should see a doctor for a full evaluation, because sometimes the cause is a serious medical problem.
Dr. Robert Kwok
Dr. Robert Kwok
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