Nhận biết được triệu chứng. Trò chuyện với bác sĩ. Tìm hiểu một vài sự thật về bệnh suy chức năng tuyến giáp và tăng cân.

Given the above summary, write a detailed text in English for it.
Hypothyroidism has a wide range of symptoms from weight gain to dry skin. These can appear suddenly, or, like weight gain, get worse gradually.   The symptoms of hypothyroidism include: unexpected weight gain, fatigue, increased sensitivity to cold, constipation, dry skin, puffy face, muscle pain, joint swelling, thinning hair, slowed heart rate, depression, heavy or irregular menstrual periods.  Symptoms vary by person and can effect everyone from infants to children and adults.  Hypothyroidism is more common in women and individuals over the age of 50. The only way to confirm that you have hypothyroidism, and that it may have caused you to gain weight, is by seeing a doctor. Your physician will confirm the diagnosis and develop a treatment plan for you.  If you do not see a doctor and ignore hypothyroidism symptoms, they will become more severe over time.  Your doctor should measure a hormone called Thyroid Stimulating Hormone to determine if you have thyroid disease. The cause of weight gain is complex and not necessarily because of hypothyroidism. Knowing some basic facts about the disease and weight gain will help you most successfully implement a diet and exercise plan, and possibly with medication for the condition.  Most weight gain related to hypothyroidism is caused by excess salt and water in your body. Your eating and fitness habits, however, may also contribute to weight gain. You can eliminate these excess elements and extra weight by watching your diet and exercise. Hypothyroidism rarely causes significant weight gain. Only about 5-10 pounds (2.2-4.8kilos) are usually attributable to the disease. If you have gained more, the cause is likely how you eat and whether you work out.  If weight gain is your only symptom of hypothyroidism, then it’s less likely that your extra pounds are due to the disease.  Some doctors believe that insulin resistance, or where your cells are not as responsive to insulin, is to blame for the weight gain, and it contributes to the problem of not being able to lose...