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Weight gain can be caused by several factors. These include an increase in bodily fluids, fat, or muscle mass. Lack of exercise and unhealthy eating also contribute to excessive weight gain. Unintentional weight gain, on the other hand, may result from certain natural conditions, certain diseases or from the use of certain medications which cause the same effects mentioned earlier. For example, kidney or heart failure may cause an increase in weight by increasing body fluids. Pregnancy also causes one to gain weight. However, this sort of weight gain varies among individuals due to genetic and environmental factors.


Hypothyroidism refers to a condition in which the thyroid gland does not produce sufficient amounts of the thyroid hormone. This hormone is primarily involved in the regulation of metabolic activities, such as efficient consumption of energy from foods, regulation of chemical, maintenance of healthy muscles and bones, etc. Low levels of this hormone retards the overall metabolic rate of the body, causing symptoms such as depression, fatigue, weakness and weight gain.

Insulin & Some Oral Hypoglycemic Agents

Diabetes Type II is a chronic disease which is also known as type II diabetes mellitus or adult-onset diabetes. In this condition the cells of the body do not respond to the insulin produced by the pancreas. Such condition referred to as "insulin resistance". This causes abnormally elevated levels of blood glucose, which then must be controlled using alternative methods. However, treatment may result in hypoglycemia, in which the medications being used lower the blood glucose to below normal levels. In this case, these medications may cause symptoms such as unexplained weight gain, hunger, dizziness and sweating. More than half of the patients taking oral hypoglycemic drugs or insulin are known to experience weight gain.

Polycystic Ovarian Syndrome

Polycystic ovarian syndrome (PCOS) is a condition which causes an imbalance in the levels of estrogen and progesterone, the sex hormones of women. This leads to the development of ovarian cysts, which are mostly benign masses. PCOS may cause irregularities in the menstrual cycle as well as problems with fertility and cardiac health. Even though the symptoms and their severity vary among women, the most common features include weight gain, pelvic pain, acne, increased hair growth, and changes in mood.


Menopause is a biological phenomenon that occurs naturally in a woman's life after a particular age (45-55 years). It demarcates the permanent end of the monthly menstrual cycle and fertility. The ovaries no longer produce eggs and levels of estrogen and progesterone decline. During this phase, women may experience many odd and negative symptoms, since the body is adjusting to the hormonal changes. Other than sudden weight gain and bloating, these may include hot flushes and temperamental changes.


Besides physiological conditions, sudden weight gain may also be a result of some psychological disorder. One such illness is dysthymia. This is a form of depression characterized by bouts of chronic hopelessness and sadness that last for several years on end. Dysthymia is more common among women and is thought to be a hereditary condition. Since depression causes abnormal changes in hormonal levels and neurotransmitters, it may cause people to indulge in overeating or binge eating, accompanied by a sedentary secluded life-style, resulting in weight gain.

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