Causes of unexplained weight gain include hormonal changes, pregnancy, fluid retention and menstruation, states Healthline. Certain medications, including birth control pills, and underlying conditions, such as Cushing syndrome, may cause unintended weight gain as well. The condition may be seasonal or continuous.
The baby, amniotic fluid, uterus growth, placenta and high blood supply cause a pregnant woman to gain weight, according to Healthline. Levels of estrogen reduce during menopause, causing women to gain weight around the hips and abdomen. Menstruation alters the levels of estrogen and progesterone, leading to sudden weight gain. Fluid retention, a condition common in people with heart and kidney failure, causes the abdomen and other body parts to swell, increasing weight.
Symptoms, which vary among different people, include gas, bloating, constipation, abdominal pain and abdominal discomfort, states Healthline. Heart palpitations, fever, breathing problems, swollen extremities, and sensitive skin that accompany increased weight requires immediate medical attention. Rapid weight gain and sweating are other serious symptoms. A medical examination and certain tests, such as magnetic resonance imaging, may help diagnose the condition.
Treatment depends upon the underlying cause and includes taking certain medications to balance the levels of hormones and undergoing surgical procedures to remove certain organs, notes Healthline. Surgery can also counter fractures, tumors and cysts that cause the problem.