Swelling of the tendons on the left side of the neck may not necessarily be caused by inflammation of the lymph or lymph nodes, but must be determined by the specific symptoms. If there are multiple granular swellings on the left side of the neck with painful pressure and clear borders, it may be caused by inflammation of the lymph nodes. However, if these swellings are not painful and are accompanied by up and down swallowing, the most common cause is a swelling of the thyroid gland, such as a thyroid nodule, thyroid adenoma or even thyroid cancer. It is also possible that the swelling and inflammation of the local muscles may lead to enlargement. It is recommended to go to the hospital to check the local ultrasound, which can basically clarify the situation.