Thyroid disease can affect many parts of your body, so the symptoms are not always obvious. Common signs include constant tiredness, sudden weight gain or weight loss, hair thinning, dry skin, mood changes, trouble sleeping, and sensitivity to heat or cold. Some people may also notice a lump or swelling in the front of the neck or experience changes in their heartbeat. If these symptoms last for several weeks, it is important to get them checked. If you are looking for the best thyroid doctor in Chennai, choose a specialist who can diagnose the condition early and recommend the right treatment.