The symptoms vary enormously between people with myasthenia gravis: 1  The muscles around the eyes are most commonly affected first, as these are constantly used and can quickly tire. 2  Muscles around the face and throat are also often affected. 3  Weakness in the arms, hands, fingers, legs and neck may develop.
In its most general form, a nipple is a structure from which a fluid emanates. More specifically, it is the projection on the breasts or udder of a mammal by which, in females, breast milk is delivered to a mother's young.
These highly sensitive body parts are both easily stimulated and easily irritated, and there are many reasons a person might find his or her nipples hurting from time to time. One of the most common (and easily cured) causes of nipple pain is wearing tight or ill-fitting undergarments and clothing. But nipple pain is also a problem for women who are pregnant or breastfeeding. In addition, sore nipples can be caused by infection, certain kinds of breast cancer and other conditions.