Left breast has shrunk and hanging. 2nd child 5 mnths breastfeeding. Taking thyronorm, thyroid 2.5 recent. What cld be the reason for shrinking?

Shrinkage of milk. glands can leave a breast have an empty of sunken appearance after cessation of breast feeding. During pregnancy and early breast feeding, the breast glands swell and become engorged and stretch the skin of the breast and may actually replace some of the normal supportive tissue of the breast. When breast feeding stops, or if an infant prefers one side, then this appearance of sagging can occur.