2.0 cm mass in right upper pole of thyroid and marked enlargement of left side. i am having neck and ear pain and dysphagia. what could be the cause ?

Yes: It's big enough to cause some problems. See your doctor to get this evaluated for an ultrasound guided fine needle biopsy.

Thyroid mass: By your post, it appears that you've had an ultrasound of your thyroid which demonstrates a mass on the right & enlargement of the left. This could certainly account for pain & difficulty swallowing. Rather than focus on symptoms as separate entity, you need to follow up w/your family doc or endocrinologist (whoever ordered the ultrasound) and proceed w/further investigation of abnormal thyroid.

Thyroid mass: This mass should be evaluated. It may be benign or malignant. Would not let it go without biopsy or surgical evaluation.