Thyroid nodules may cause neck tendon pain, and common thyroid nodules are categorized as benign and malignant, with different nodules affecting neck structures differently. The details are as follows: 1. Benign nodules: when the size of benign nodules is small, they have less impact on the neck and are less likely to cause discomfort and pain in the neck. However, when the size of benign nodules is large, some patients will have symptoms such as localized pressure, neck pain and even difficulty in swallowing. Some patients may also suffer from intracapsular hemorrhage of thyroid nodules due to sudden coughing or external impact, which may lead to neck pain. 2. Malignant nodule: malignant nodule belongs to thyroid cancer, the lesion is easy to invade other neighboring structures, such as trachea, esophagus, neck lymph nodes, nerves, etc., which may cause neck pain. Such patients need to seek medical treatment as soon as possible to avoid deterioration of their condition. Thyroid nodules are prone to cause neck tendon pain. If accompanied by other discomforts, it is recommended to seek timely medical treatment to identify the cause of the disease and treat it as soon as possible.