There are two types of thyroid disease. Hyper and hypo. Hyper can cause faster heart rate, increased body heat, weight loss, etc. hypo is what u are describing. I am hypo also and have been for 15 yeArs. Common symptoms are weight gain, dry skin, excessive cold when others feel fine, dry/brittle/ripping nails, hair loss, fatigue/ exhaustion. It can be managed by medication.