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 several symptoms: 1  You may get a lump or swelling in your neck. This is the most common symptom. 2  You may have pain in your neck and sometimes in your ears. 3  You may have trouble swallowing.  You may have trouble breathing or have constant 1  wheezing. Your voice may be hoarse.