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.
Hypothyroidism: Common symptoms of hypothyroidism include sensitivity to cold temperatures, mild weight gain, fatigue, constipation, small thyroid gland, enlarged neck, dry skin, hair loss, muscle cramps, heavy and irregular menstruation, and difficulty thinking or concentrating.our thyroid is a butterfly-shaped gland located at the base of your neck that produces thyroid hormone, which helps to regulate your metabolism. In some cases, thyroid problems may cause a visible lump in your neck, indicating an enlargement or a cyst, nodule or goiter on your thyroid.