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Hypothyroidism
In medicine, “hypo” means deficient or not enough. For example, hypoglycemia is a term for low blood sugar. Hypothyroidism, then, is a condition in which the thyroid gland does not produce enough hormones. Inflammation and damage to the gland accounts for most cases of hypothyroidism, says the NIH. Symptoms vary from person to person, and if left untreated, they tend to worsen over time. People with hypothyroidism may feel more sensitive to temperature changes. Individuals might also experience a number of physical effects, including constipation, fatigue, weakness, joint or muscle pain and unintentional weight gain. The condition can also affect mood, causing depression or memory problems.

Hypothyroidism is typically treated with thyroid replacement therapy. Different medications can imitate and replace the role of the thyroid hormone inside the body, making up for its natural lack. This treatment usually lasts for a patient’s entire life and dosage might change over time.

Hyperthyroidism
While “hypo” means not enough, “hyper” indicates too much. Hyperthyroidism occurs when the thyroid gland produces an excess of hormones. The most common cause for hyperthyroidism is the autoimmune disorder Graves’ disease. Also known as an overactive thyroid, the hormone overload can cause a wide range of physical changes. Many symptoms overlap with hypothyroidism, including thinning hair, dry skin and temperature sensitivity. However, while hypothyroidism causes fatigue initially, hyperthyroidism kicks metabolism into overdrive and makes a person restless and excitable. Nonetheless, as time passes and the body stays too stimulated, tiredness will eventually take over as well. Hyperthyroidism may also cause weight loss, hair loss, high blood pressure, nausea and vomiting, nervousness and an irregular menstrual period in women.

Read more here>>http://www.foxnews.com/health/2012/02/10/hypothyroidism-versus-hyperthyroidism/