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Subclinical hypothyroidism is a biochemical disorder marked by an increased thyroid-stimulating hormone (TSH) level, but circulating thyroid hormones, especially thyroxine (T4), stay below the normal limits. Many people don't show distinct or noticeable symptoms; thus, it is commonly found by chance during normal blood tests. When symptoms are there, they may be modest, including tiredness, weight gain, cold sensitivity, or mood changes, which are easy to miss or think are caused by something else.

Older adults and women are more likely to have this problem, especially if they have autoimmune thyroid disorders or a family history of thyroid disease. Chronic autoimmune thyroiditis is the most common underlying cause. This condition is when the immune system slowly affects how the thyroid works.

How to treat subclinical hypothyroidism depends on factors including TSH (thyroid-stimulating hormone) levels, age, symptoms, and other health hazards. In many cases, especially when TSH levels are only slightly high, doctors choose to "watch and wait" and check on patients often. But people with higher TSH levels, those who are pregnant, or those who have severe symptoms may need to take low-dose thyroid hormone replacement.

Early detection and close monitoring are crucial to prevent the disease from worsening and to maintain your overall metabolic health.