If this is a sound wave, the denser the medium, the faster the wave. For a light wave, the denser the medium, the slower the wave. It all depends on the medium through which it travels. The factor of the medium that plays a role on the velocity of a wave is its density. If this is a sound wave, the denser the medium, the faster the wave.
Mastitis is an infection of the tissue of the breast that occurs most frequently during the time of breastfeeding. This infection causes pain, swelling, redness, and increased temperature of the breast. It can occur when bacteria, often from the infant's mouth, enter a milk duct through a crack in the nipple. This causes an infection and painful inflammation of the breast.
Thyroiditis is an inflammation (not an infection) of the thyroid gland. Several types of thyroiditis exist, and the treatment is different for each. Treatment should begin with thyroid hormone replacement. 2  This prevents or corrects the hypothyroidism, and it also generally keeps the gland from getting larger. 3  In most cases, the thyroid gland will decrease in size once thyroid hormone replacement is started.