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9 Common Causes of Sudden Weight Gain

Overeating or Poor Diet

Consuming excessive calories or indulging in unhealthy foods can lead to weight gain.

Sedentary Lifestyle

Lack of physical activity and a sedentary lifestyle can contribute to weight gain.

Fluid Retention

Certain medical conditions or medications can cause fluid retention, resulting in sudden weight gain.

Hormonal Changes

Hormonal imbalances, such as those associated with conditions like polycystic ovary syndrome (PCOS) or hypothyroidism, can cause weight gain.

Medication Side Effects

Some medications, including certain antidepressants, antipsychotics, and corticosteroids, may have weight gain as a side effect.

Stress and Emotional Factors

Emotional eating or increased stress levels can lead to weight gain.


During menopause, hormonal changes can cause weight gain, particularly around the abdomen.

Medical Conditions

Certain medical conditions like Cushing's syndrome, insulin resistance, or metabolic disorders can contribute to sudden weight gain.


Weight gain is a normal part of pregnancy as the body undergoes various physiological changes to support fetal development.

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