I believe they mean that the random variables have a common support. For example, if X ~ Unif[0,2] and Y ~ Unif[1,3], then their respective PDF's overlap in the interval [1,2], meaning the only interval where both X and Y can have common values is [1,2]. To illustrate, below is a representation of the supports of X and Y, below which is a representation of the real line.
1 Thyroid cancer is a malignant tumor of the thyroid gland. 2  Symptoms of thyroid cancer include swelling in the neck (goiter), neck pain, hoarseness, swallowing and breathing problem, swollen lymph gland in the neck.
Contents. 1  Sudden onset of neck mass AND Swollen neck lymph nodes AND Swollen glands: Causes of All Symptoms. 2  Sudden onset of neck mass OR Swollen neck lymph nodes OR Swollen glands: 460 causes. 3  Sudden onset of neck mass: Causes. 4  Sudden onset of neck mass: Introduction. 5  Swollen neck lymph nodes: 212 causes. 6  Swollen neck lymph nodes: Introduction.