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Hypothyroidism is a condition in which the thyroid gland is unable to produce enough thyroid hormone(a deficiency of thyroid hormone).
The most common cause of hypothyroidism is a lack of iodine (iodine deficiency) but can also be caused by other various conditions of the thyroid gland or, less commonly, the pituitary gland or hypothalamus. It can result from a lack of thyroid gland and also can be associated with increased stress. Hypothyroidism is a very common condition. It is estimated that 3% to 5% of the population has some form of hypothyroidism, the condition is more common in women than in men and its incidence increases with age.
There are many disorders that result in hypothyroidism. These disorders may directly or indirectly involve the thyroid gland, because thyroid hormone affects growth, development, and many cellular processes, inadequate thyroid hormone has widespread consequences for the body. Severe hypothyroidism in infants can result in cretinism.

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Symptoms
The symptoms of hypothyroidism are often subtle. They are may take other forms (which means they can mimic the symptoms of many other conditions) and are sometimes attributed to aging. Patients with mild hypothyroidism may have no symptoms.
Symptoms becomes more obvious as the condition worsens and the majority of these complaints are related to a metabolic slowing of the body.

Below are the hypothyroidism signs and symptoms :
Depression
Fatigue
Modest weight gain
Cold intolerance
Excessive sleepiness
Dry, coarse hair
Dry skin
Muscle cramps
Increased cholesterol levels
Swelling of the legs
Constipation
Vague aches and pains
Decreased concentration
As the disease advances it becomes more severe, the patient might notice the following symptoms:
Puffiness around the eyes
Slowing of the heart rate and a drop in body temperature followed by heart failure.
In its most profound form, severe hypothyroidism may lead to a life threatening coma (myxedema coma).In a severely hypothyroid individual, amyxedema coma tends to be triggered by severe illness,surgery,stress, or traumatic injury. This condition requires hospitalization and immediate treatment with thyroid hormones given by injection.
Properly diagnosed hypothyroidism can be easily and completely treated with thyroid hormone replacement. On the other hand, untreated hypothyroidism can lead to an enlarged heart (cardiomyopathy), worsening heart failure and an accumulation of fluid around the lungs (pleural effusion).

Hypothyroidism in children and teens
Children and teens develop similar signs and symptoms as in the case of an adult, but may experience other symptoms such as:

Stunted growth, resulting in short stature
Delayed development of permanent teeth
Delayed puberty
Poor mental development
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Causes
Below are the causes of hypothyroidism
An autoimmune disease: This condition occurs when the antibodies in your system fends off new and healthy cells. Sometimes, your body confuses normal, healthy cells for invading cells. This is called an autoimmune response. If the autoimmune response isn’t corrected those antibodies could attack healthy tissues. Thus, causing serious health issues, including conditions like hypothyroidism.

Treatment for hyperthyroidism: This condition occurs when there is an excess production of thyroid hormone, this condition is known as hyperthyroidism. In order for this condition =https=www.gregoryhealthworld.com/2018/11/hypothyroidism-major-causes-symptoms.html