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There are instances in everyone’s life when at some point we unintentionally gain weight in spite of not consuming more calories or being physically active. If you find yourself in such a position, do not fret. Knowing the reasons for the sudden change and how to combat it will put your mind at ease.

Unintentional weight gain can be of 3 types. It can be periodic, like when a woman undergoes through her menstrual cycle, gradual, during pregnancy, and rapid, due to medication.

8 reasons why you may gain weight all of a sudden.

  1. Thyroid disorder
  2. Medication
  3. Fluid retention
  4. Insomnia
  5. Stress
  6. Small intestinal bacterial overgrowth
  7. Menopause
  8. Slow metabolism

Thyroid disorder:

One of the most common reasons for a sudden weight gain can be attributed to a Thyroid disorder. When the butterfly-shaped gland inside your throat does not generate enough of two hormones T3 and T4, you may gain weight rather abruptly. This condition is known as Hypothyroidism and can be confirmed by getting tested. In addition to gaining weight suddenly, other symptoms include hair loss, fatigue, and depression.


Not many people are aware of the fact that taking medicines can also be one of the reasons for a sudden weight gain. Medication taken for psychological issues like depression and bipolar disorder are known to increase the urge to eat more and in turn, make you gain weight.

Apart from this, medicines taken for blood pressure and diabetes may also hinder your weight balance. Do remember to check with your doctor if the prescribed medicines have a tendency to affect your body weight.

Fluid retention::

People who have a heart, liver, or kidney disease and are taking medication for it might lead to fluid swelling. This results in the retention of water in their limbs, feet, abdomen, and face. This condition is known as Edema and needs to be reported to your doctor.


Getting a good night’s sleep is vitally important for a healthy body and mind. This also means that if you are deprived of sleep continuously, it may increase your bodyweight rapidly due to messy metabolism. It may also be due to the constant urge to snack on unhealthy food during the awake hours.


Being constantly stressed about something or leading a hectic and crazy lifestyle can also be a reason for your sudden weight gain. When you are stressed, your body releases a stress hormone known as Cortisol. Excess release of this hormone results in storing fat in your body and making you gain weight over the course of time.

Small intestinal bacterial overgrowth::

Our stomach harbors good bacteria known as probiotics that help in proper digestion. However, the stomach also contains bad bacteria. When the balance between these bacteria messes, it results in Small Intestine bacteria Overgrowth (SIBO). When this happens, there is an excess formation of gas in your gut, in addition to abdominal pain, bloating, and weight gain. In this case, you need to consult with a doctor to get it treated. The treatment would generally include antibiotics to contain the bacterial growth.


Women in their 45-55 years will experience a hormonal change in their bodies triggered by a natural condition called menopause. This happens when the hormone, Estrogen, that is responsible for regulating menstruation and ovulation starts declining. This eventually results in an increase in weight, especially around the abdomen and hips. A condition called Polycystic Ovarian Syndrome (PCOS) in women can also be a reason for sudden weight gain.

Slow metabolism:

As you age, your metabolism also starts slowing down and this eventually will result in you gaining weight in spite of trying your best to be in shape. Whichever might be the reason for your unintentional weight gain, we recommend you to Consult a Doctor to confirm the reason for it. Your doctor will check your medical history or suggest a few investigative tests to confirm the reason. In case of a hormonal imbalance, medication will be Prescribed to balance it.



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