Weight Gain
While weight gain is a natural part of life, suddenly gaining weight without trying to make dietary modifications may be a sign of an underlying problem.
Around half of those with hypothyroidism experience weight gain as part of their symptoms. Since hypothyroidism slows down your metabolism, you’re unlikely to burn calories quickly enough. [3] You gain extra weight as a result. Some of the weight gain due to an underactive thyroid is caused by the buildup of fat, but most of the weight gain is due to the accumulation of excess salt and water.
This weight gain is not always noticeable in everyone. Most people do not gain more than 10 pounds. The normal range is 5 to 10, but some people with severe hypothyroidism gain a bit more. [4] If weight gain is the only hypothyroidism symptom you have, you should see your doctor as you may have other health problems.