Symptom: Weight Gain

    Weight gain can result from an increase in body fluid, muscle mass, or fat. An increase in body fluid can come from medications, fluid and salt retention, intravenous fluid infusion, kidney or heart failure. An increase in muscle mass is commonly seen with exercising. An increase in body fat is commonly seen as a result of diet or lack of exercise as the body converts muscle to fat. An excessive weight gain is referred to as obesity. Obesity is a function of environmental (diet, exercise, lifestyle, etc.), hormonal, and inherited (genetic) factors in varying degrees. Weight gain is a normal part of pregnancy.

    Source: http://www.rxlist.com

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    Pain Health Center an online symptom search and symptom directory. Here you can find what is the symptom Weight Gain and what does it mean, you can also check what illnesses and diseases this symptom relates to.