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.
Nipple inversion may be a developmental problem caused by tethering of the developing nipple by short ducts. The nipple will have been pulled in ever since the breast developed. New inversion occurring later in life needs to be carefully assessed to find a cause as it is sometimes due to a cancer pulling on the ducts. Inflammatory conditions like periductal mastitis and duct ectasia can also cause this problem.