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.
Thyroid cancer can cause many symptoms, including: 1  A lump or swelling in your neck. 2  Pain in your neck and sometimes in your ears. 3  Difficulty swallowing. 4  Difficulty breathing or constant wheezing. 5  Hoarseness that is not related to a cold. 6  A cough that continues and is not related to a cold.