As you wife has about 10 days to go before the start of her period, the pain in her nipples is likely to be because of hormonal changes going on in her body with fluid retention.
This is very common around that time before a period starts. She may also have other symptoms like fluid retention (swollen fingers, feet, tummy), she may also get mood swings or food cravings. This is referred to as Premenstrual Tension (PMT) or Premenstrual Syndrome (PMS).
She may find that taking Evening Primrose Oil capsules very helpful. You can buy this from your pharmacy, and large superstores and follow the directions on the packet.
Get your wife to keep a journal of her menstrual cycle and to jot down the days of when she gets her nipple pain or tender nipples and breasts and any other symptoms. She will find that the nipples will be fine once her period starts.
In the event this continues even after her period, then it would be wise to get checked out.
Best wishes.
Best wishes.
The followin is the explanation of your wife's problem
Nipple pain can describe any discomfort in the nipple area and can result from mild physical surface abrasion from such activities as breastfeeding, engaging in physical activity (for example, exercise or jogging) without a bra, wearing a poorly fitted bra, or participating in any activity that produces friction on the skin of the breast.
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Nipple pain can also be caused by specific disorders, particularly inflammatory disorders. Both mastitis (an infection and inflammation of the ducts of the breast) and breast abscess (a collection of pus located in a specific area) can result in nipple pain. These conditions are common in women who are breastfeeding.
A rare type of cancer, known as Paget’s disease of the breast (also known as Paget's disease of the nipple, or simply Paget's disease), can result in inflammation and pain that is particularly localized to the nipple area.
Ordinary soreness from surface abrasions should clear up within a few days. Inflammatory conditions will need more attention. Seek prompt medical care if you experience any of the following symptoms: excessive cracking or open wounds on the surface of the nipple or areola; heat or redness in the nipple, breast tissues, or on the breast surface; nipple or breast pain on one side only; fever or chills; new, unusual, or changing lumps in the breast; nipple abscess or nipple discharge not related to breastfeeding, especially a brown or bloody discharge; or bleeding from the nipple.
If your nipple pain is persistent or causes you concern, seek prompt medical care.