Rapid Weight Gain Causes & Concerns

If you are eating healthy and exercises, but still experiencing rapid weight gain, there may be some other reason that you are gaining weight. Here are a few of the main culprits outside of just eating too much and lack of activity.


This thyroid hormone deficiency is characterized by your thyroid not producing enough thyroid hormones. Thyroid hormones affect your metabolic activity, therefore if they are not functioning properly, you can gain weight fast.

Cushing Syndrome

This is a tumor in your pituitary gland that causes an imbalance in your hormones, triggering glands on the kidneys to release too much cortisol. Once your cortisol level goes up, your weight likewise elevates.


When you are going through menopause, the following change levles:

  • Estrogen
  • Progesterone
  • Testosterone 
  • Androgen

These hormone fluctuations, along with the effects of aging such as a slower metabolism, can cause unexplained weight gain.

Essential Fatty Acid Deficiency

You need fatty acids to make hormones that help to maintain your body’s metabolism. A deficiency in these fatty acids could leave you to crave fatty foods, which could be one of the causes of your quick weight gain.

Polycystic Ovarian Syndrome

This is characterized by:

  • irregular menstrual periods
  • acne
  • obesity 
  • excess hair growth

It is unsure whether weight gain triggers polycystic ovarian syndrome, or whether the syndrome causes weight gain, but they do normally go hand-in-hand.

If you are eating a healthy diet and exercising, but have recently experienced an unexplained weight gain, you may have an underlying medical condition that needs attention. Contact your doctor and schedule an appointment, and have your recent weight gain evaluated by a medical professional.


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